Document:

Form of Supplemental Agreement

 Exhibit 10.26 

SUPPLEMENTAL AGREEMENT TO THE 

MANAGEMENT STOCKHOLDER’S AGREEMENT AND THE SALE 

PARTICIPATION AGREEMENT 

This Supplemental Agreement to the Management Stockholder’s Agreement and the Sale Participation Agreement (the
“Agreement”) is dated as of May 15, 2008 by and between Affinia Group Holdings Inc., a Delaware corporation (the “Company”), Cypress Merchant Banking Partners II L.P. a Delaware limited partnership (“Cypress
Onshore”), Cypress Merchant Banking II C.V., a limited partnership formed under the laws of The Netherlands (“Cypress Offshore”),
55th Street Partners II L.P., a Delaware limited
partnership (“55th Street”), Cypress
Side-by-Side L.L.C., a Delaware limited liability company (“Side by Side” and, together with Cypress Onshore, Cypress Offshore and
55th Street, the “Cypress Entities”) and the
undersigned person (the “Management Stockholder”) (the Company, the Cypress Entities and the Management Stockholder being hereinafter collectively referred to as the “Parties”). 

RECITALS 

WHEREAS, the Company and the Management Stockholder entered into that certain Management Stockholder’s Agreement, dated as of
                                 (the “Management Stockholders
Agreement”); 
 WHEREAS, the Cypress Entities and the Management Stockholder entered into that certain Sale Participation
Agreement, dated as of                                  (the “Sale
Participation Agreement”); 
 WHEREAS, the Management Stockholder is a participant under the Affinia Group Senior Executive
Deferred Compensation and Stock Award Plan (the “Plan”), under which the Management Stockholder’s deferred compensation account is notionally invested in Company common stock, and pursuant to which the Management Stockholder may
receive a future distribution from the Plan in the form of Company common stock, in each case subject to an in accordance with the Plan’s terms; 

WHEREAS, all shares of Company common stock distributed to the Management Stockholder under the Plan are required to be subject to the
Management Stockholders Agreement, and it is a condition to the Management Stockholder’s right to participate under the Plan that such Management Stockholder enter into the Management Stockholders Agreement; and 

WHEREAS, the Parties wish to clarify the applicability of the provisions of the Management Stockholders Agreement and the Sale
Participation Agreement to the shares of Company common stock issuable and issued under the Plan. 
 NOW, THEREFORE, in
consideration of the mutual promises hereinafter set forth and for other good and valuable consideration, and upon the terms and conditions contained herein, the Parties agree as follows. Capitalized terms used herein which are undefined shall have
the meaning assigned thereto in the Management Stockholders Agreement, the Sale Participation or the Plan, as specified herein. 

 Section 1. The Company and the Management Stockholder agree that Shares (as such term
is defined in the Plan) issuable and issued under the Plan to the Management Stockholder shall constitute “Stock” for purposes of the Management Stockholders Agreement and shall be subject to all the terms and conditions of the Management
Stockholders Agreement, with the following variations: 
 (a) With respect to any Share issued under the Plan,
the definition of “Base Price” with respect to such Share for purposes of Sections 6 and 7 of the Management Stockholders Agreement shall mean the “Fair Market Value” (as defined under the Plan) of such Share on the
“Investment Date” (as defined under the Plan); and 
 (b) Upon an “Initial Public Offering”
(as defined under the Plan), the provisions of the Management Stockholders Agreement, as they relate to Shares issued under the Plan, shall lapse. 

Section 2. Except as expressly amended, modified or supplemented hereby, the Company and the Management Stockholder otherwise
reaffirm all other provisions contained in the Management Stockholders Agreement. 
 Section 3. The Cypress Entities and
the Management Stockholder agree that Shares (as such term is defined in the Plan) issued under the Plan to the Management Stockholder shall constitute “Common Stock” for purposes of the Sale Participation Agreement and, when issued under
the Plan, shall be subject to all the terms and conditions of the Sale Participation Agreement. 
 Section 4. Except as
expressly amended, modified or supplemented hereby, the Cypress Entities and the Management Stockholder otherwise reaffirm all other provisions contained in the Sale Participation Agreement. 

Section 5. The laws of the State of Delaware shall govern the interpretation, validity and performance of the terms of this
Agreement 
 Section 6. This Agreement may be executed in counterparts, and by different parties on separate
counterparts, each of which shall be deemed an original, but all such counterparts shall together constitute one and the same instrument. 

[remainder of page intentionally omitted] 

 IN WITNESS WHEREOF, the Parties have executed this Agreement as of the date first above
written. 
  

			
	MANAGEMENT STOCKHOLDER.
		
	Signature:	 	 
		
	Printed Name:	 	 
		
	Address:	 	
		 	
		
	 	 	 
		 	
		
	 	 	 

 The undersigned solely for purposes of
Sections 1, 2, 5 and 6 with respect to the Management Stockholders Agreement. 
  

			
	AFFINIA GROUP HOLDINGS INC.
		
	By:	 	 
		 	 Name:

Title:

 The undersigned Cypress Entities solely for purposes of Sections 3, 4, 5 and 6 with respect to the Sale
Participation Agreement. 
  

					
	CYPRESS MERCHANT BANKING PARTNERS II L.P.
		
	By:	 	Cypress Associates II LLC, its general partner
			
		 	By:	 	 
		 		 	 Name:
 Title: Managing
Member

	
	55th STREET
 PARTNERS II L.P.
		
	By:	 	Cypress Associates II LLC, its general partner
			
		 	By:	 	 
		 		 	 Name:
 Title: Managing
Member

	
	CYPRESS MERCHANT BANKING II C.V.
		
	By:	 	Cypress Associates II LLC, its managing general partner
			
		 	By:	 	 
		 		 	 Name:
 Title: Managing
Member

	
	CYPRESS SIDE-BY-SIDE LLC
			
		 	By:	 	 
		 		 	 Name:

Title:Form of Management Confidentiality, Non-Competition & Proprietary Info Agreement

 Exhibit 10.27 

Confidentiality, Non-Competition and Proprietary Information Agreement 

This Confidentiality, Non-Competition and Proprietary Information Agreement (the “Agreement”), is made effective as of
                        , between Affinia Group Holdings Inc. (the “Company”), and the employee signatory hereof
(the “Employee”). 
 R E C I T A L S: 

WHEREAS, the Company has granted Employee an option to purchase shares of the Company (the “Option”); and 

WHEREAS, Employee, in consideration for the grant of the Option, has agreed to be subject to the restrictive covenants set forth in this
Agreement. 
 NOW THEREFORE, for good and valuable consideration, the parties agree as follows: 

1. Confidentiality. 

(a) Employee will not at any time (whether during or after Employee’s employment with the Company or any subsidiary) (x) retain
or use for the benefit, purposes or account of Employee or any other Person (as defined below); or (y) disclose, divulge, reveal, communicate, share, transfer or provide access to any Person outside the Company or any subsidiary (other than its
professional advisers who are bound by confidentiality obligations), any non-public, proprietary or confidential information —including without limitation trade secrets, know-how, research and development, software, databases, inventions,
processes, formulae, technology, designs and other intellectual property, information concerning finances, investments, profits, pricing, costs, products, services, vendors, customers, clients, partners, investors, personnel, compensation,
recruiting, training, advertising, sales, marketing, promotions, government and regulatory activities and approvals — concerning the past, current or future business, activities and operations of the Company, its subsidiaries or affiliates
and/or any third party that has disclosed or provided any of same to the Company on a confidential basis (“Confidential Information”) without the prior written authorization of the Company’s board of directors. 

(b) “Confidential Information” shall not include any information that is (a) generally known to the industry or the public
other than as a result of Employee’s breach of this covenant or any breach of other confidentiality obligations by third parties; (b) made legitimately available to Employee by a third party without breach of any confidentiality
obligation; or (c) required by law to be disclosed; provided that Employee shall give prompt written notice to the Company of such requirement, disclose no more information than is so required, and cooperate with any attempts by the
Company to obtain a protective order or similar treatment. 
 (c) Except as required by law, Employee will not disclose to
anyone, other than Employee’s immediate family and legal or financial advisors, the existence or contents of this Agreement; provided that Employee may disclose to any prospective future employer the provisions of this Agreement provided
they agree to maintain the confidentiality of such terms. 

 (d) Upon termination of Employee’s employment with the Company and its subsidiaries for
any reason, Employee shall (x) cease and not thereafter commence use of any Confidential Information or intellectual property (including without limitation, any patent, invention, copyright, trade secret, trademark, trade name, logo, domain
name or other source indicator) owned or used by the Company, its subsidiaries or affiliates; (y) immediately destroy, delete, or return to the Company, at the Company’s option, all originals and copies in any form or medium (including
memoranda, books, papers, plans, computer files, letters and other data) in Employee’s possession or control (including any of the foregoing stored or located in Employee’s office, home, laptop or other computer, whether or not Company
property) that contain Confidential Information or otherwise relate to the business of the Company, its affiliates and subsidiaries, except that Employee may retain only those portions of any personal notes, notebooks and diaries that do not contain
any Confidential Information; and (z) notify and fully cooperate with the Company regarding the delivery or destruction of any other Confidential Information of which Employee is or becomes aware. 

2. Non-Competition. 

(a) Employee acknowledges and recognizes the highly competitive nature of the business of the Company and accordingly agrees as follows:

 (i) During the term of Employee’s employment and, for a period of one year following the date Employee
ceases to be employed by the Company and its subsidiaries (the “Restricted Period”), Employee will not, whether on Employee’s own behalf or on behalf of or in conjunction with any person, firm, partnership, joint venture, association,
corporation or other business organization, entity or enterprise whatsoever (“Person”), directly or indirectly solicit or assist in soliciting in competition with the Company or any subsidiary, the business of any client or prospective
client: 
 (A) with whom Employee had personal contact or dealings on behalf of the Company or any subsidiary
during the one year period preceding Employee’s termination of employment; 
 (B) with whom employees
reporting to Employee have had personal contact or dealings on behalf of the Company or any subsidiary during the one year immediately preceding the Employee’s termination of employment; or 

(C) for whom Employee had direct or indirect responsibility during the one year immediately preceding Employee’s
termination of employment. 
 (ii) During the Restricted Period, Employee will not directly or indirectly:

 (A) engage in any business that competes with the business of the Company or its subsidiaries (including,
without limitation, businesses which the Company or its subsidiaries have specific plans to conduct in the future and as to which Employee is aware of such planning) in any geographical area that is within

 
100 miles of any geographical area where the Company or its subsidiaries manufactures, produces, sells, leases, rents, licenses or otherwise provides its products or services (a “Competitive
Business”); 
 (B) enter the employ of, or render any services to, any Person (or any division or controlled
or controlling affiliate of any Person) who or which engages in a Competitive Business; 
 (C) acquire a
financial interest in, or otherwise become actively involved with, any Competitive Business, directly or indirectly, as an individual, partner, shareholder, officer, director, principal, agent, trustee or consultant; or 

(D) interfere with, or attempt to interfere with, business relationships (whether formed before, on or after the date of
this Agreement) between the Company or any of its subsidiaries and customers, clients, suppliers partners, members or investors of the Company or its affiliates. 

(iii) Notwithstanding anything to the contrary in this Agreement, Employee may, directly or indirectly own, solely as an
investment, securities of any Person engaged in the business of the Company or its subsidiaries which are publicly traded on a national or regional stock exchange or on the over-the-counter market if Employee (i) is not a controlling person of,
or a member of a group which controls, such person and (ii) does not, directly or indirectly, own 5% or more of any class of securities of such Person. 

(iv) During the Restricted Period, Employee will not, whether on Employee’s own behalf or on behalf of or in
conjunction with any Person, directly or indirectly: 
 (A) solicit or encourage any employee of the Company or
its affiliates to leave the employment of the Company or its subsidiaries; or 
 (B) hire any such employee who
was employed by the Company or its subsidiaries as of the date of Employee’s termination of employment with the Company or who left the employment of the Company or its subsidiaries coincident with, or within one year prior to or after, the
termination of Employee’s employment with the Company and its subsidiaries. 
 (v) During the Restricted
Period, Employee will not, directly or indirectly, solicit or encourage to cease to work with the Company or its subsidiaries any consultant then under contract with the Company or its affiliates. 

(b) It is expressly understood and agreed that although Employee and the Company consider the restrictions contained in this
Section 2 to be reasonable, if a final judicial determination is made by a court of competent jurisdiction that the time or territory or any other restriction contained in this Agreement is an unenforceable restriction against Employee, the
provisions of this Agreement shall not be rendered void but shall be deemed amended to apply as to such maximum time and territory and to such maximum extent as such court may judicially determine or indicate to be enforceable. Alternatively, if any
court of competent jurisdiction finds that any restriction contained in this Agreement is unenforceable, and such restriction cannot be amended so as to make it enforceable, such finding shall not affect the enforceability of any of the other
restrictions contained herein. 

 3. Inventions. 

(a) If Employee has created, invented, designed, developed, contributed to or improved any works of authorship, inventions, intellectual
property, materials, documents or other work product (including without limitation, research, reports, software, databases, systems, applications, presentations, textual works, content, or audiovisual materials) (“Works”), either alone or
with third parties, prior to Employee’s employment by the Company or its subsidiaries, that are relevant to or implicated by such employment (“Prior Works”), Employee hereby grants the Company a perpetual, non-exclusive, royalty-free,
worldwide, assignable, sublicensable license under all rights and intellectual property rights (including rights under patent, industrial property, copyright, trademark, trade secret, unfair competition and related laws) therein for all purposes in
connection with the Company’s current and future business. 
 (b) If Employee creates, invents, designs, develops,
contributes to or improves any Works, either alone or with third parties, at any time during Employee’s employment by the Company or its subsidiaries and within the scope of such employment and/or with the use of any the Company resources
(“Company Works”), Employee shall promptly and fully disclose same to the Company and hereby irrevocably assigns, transfers and conveys, to the maximum extent permitted by applicable law, all rights and intellectual property rights therein
(including rights under patent, industrial property, copyright, trademark, trade secret, unfair competition and related laws) to the Company to the extent ownership of any such rights does not vest originally in the Company. 

(c) Employee agrees to keep and maintain adequate and current written records (in the form of notes, sketches, drawings, and any other
form or media requested by the Company) of all Company Works. The records will be available to and remain the sole property and intellectual property of the Company at all times. 

(d) Employee shall take all requested actions and execute all requested documents (including any licenses or assignments required by a
government contract) at the Company’s expense (but without further remuneration) to assist the Company in validating, maintaining, protecting, enforcing, perfecting, recording, patenting or registering any of the Company’s rights in the
Prior Works and Company Works. If the Company is unable for any other reason to secure Employee’s signature on any document for this purpose, then Employee hereby irrevocably designates and appoints the Company and its duly authorized officers
and agents as Employee’s agent and attorney in fact, to act for and in Employee’s behalf and stead to execute any documents and to do all other lawfully permitted acts in connection with the foregoing. 

(e) Employee shall not improperly use for the benefit of, bring to any premises of, divulge, disclose, communicate, reveal, transfer or
provide access to, or share with the Company any confidential, proprietary or non-public information or intellectual property relating to a former employer or other third party without the prior written permission of such third party. Employee
hereby indemnifies, holds harmless and agrees to defend the Company and its officers, directors, partners, employees, agents and representatives from any breach of the 

 
foregoing covenant. Employee shall comply with all relevant policies and guidelines of the Company, including regarding the protection of confidential information and intellectual property and
potential conflicts of interest. Employee acknowledges that the Company may amend any such policies and guidelines from time to time, and that Employee remains at all times bound by their most current version. 

(f) The provisions of Section 3 shall survive the termination of Employee’s employment for any reason. 

4. Specific Performance. Employee acknowledges and agrees that the Company’s remedies at law for a breach or threatened
breach of any of the provisions of Section 1, Section 2, and Section 3 would be inadequate and, in recognition of this fact, Employee agrees that, in the event of such a breach or threatened breach, in addition to any remedies at law
and/or otherwise available to the Company under the terms of any compensation plan, program or arrangement (including Affinia Group Holdings Inc. 2005 Stock Incentive Plan), the Company, without posting any bond, shall be entitled to cease making
any payments or providing any benefit otherwise required by the Company and obtain equitable relief in the form of specific performance, temporary restraining order, temporary or permanent injunction or any other equitable remedy which may then be
available. 
 5. Miscellaneous. 

(a) Governing Law. This Agreement shall be governed by and construed in accordance with the laws of the State of New York, without
regard to the conflict of laws provisions thereof. 
 (b) Entire Agreement/Amendments. This Agreement contains the entire
understanding of the parties with respect to the subject matter hereof. There are no restrictions, agreements, promises, warranties, covenants or undertakings between the parties with respect to the subject matter herein other than those expressly
set forth herein. This Agreement may not be altered, modified, or amended except by written instrument signed by the parties hereto. 

(c) No Waiver. The failure of a party to insist upon strict adherence to any term of this Agreement on any occasion shall not be
considered a waiver of such party’s rights or deprive such party of the right thereafter to insist upon strict adherence to that term or any other term of this Agreement. 

(d) Severability. In the event that any one or more of the provisions of this Agreement shall be or become invalid, illegal or
unenforceable in any respect, the validity, legality and enforceability of the remaining provisions of this Agreement shall not be affected thereby. 

(e) Assignment. This Agreement shall not be assignable by Employee. This Agreement may be assigned by the Company to a person or
entity which is an affiliate or a successor in interest to substantially all of the business operations of the Company. Upon such assignment, the rights and obligations of the Company hereunder shall become the rights and obligations of such
affiliate or successor person or entity. 

 (f) Successors; Binding Agreement. This Agreement shall inure to the benefit of and
be binding upon personal or legal representatives, executors, administrators, successors, heirs, distributes, devises and legatees of the parties hereto. 

(g) Counterparts. This Agreement may be signed in counterparts, each of which shall be an original, with the same effect as if the
signatures thereto and hereto were upon the same instrument. 
 IN WITNESS WHEREOF, the parties hereto have executed this
Agreement on the date first set forth above. 
  

			
	AFFINIA GROUP HOLDINGS INC.
		
	By:	 	 
		 	 Name:

Title:

	
	EMPLOYEE
	
	 
	(Signature)
	
	 
	(Print Name)

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