Document:

Supplemental Indenture, dated as of May 27, 2010

 EXHIBIT 4.1 

SUPPLEMENTAL INDENTURE 

SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”) dated as of May 27, 2010, among COOPER-STANDARD AUTOMOTIVE
INC., an Ohio corporation (the “New Company”), COOPER-STANDARD HOLDINGS INC., a Delaware corporation (the “Parent Guarantor”), the subsidiaries of the New Company set forth on the signature page hereto (together
with the Parent Guarantor, the “Guarantors”) and U.S. BANK NATIONAL ASSOCIATION, a national banking association, as trustee under the indenture referred to below (the “Trustee”). 

W I T N E S S E T H : 

WHEREAS CSA Escrow Corporation (the “Company”) has heretofore executed and delivered to the Trustee
an indenture (as amended, supplemented or otherwise modified, the “Indenture”) dated as of May 11, 2010, providing for the issuance of the Company’s $450,000,000 aggregate principal amount of the
8 1/2% Senior Notes due 2018 (the
“Securities”); 
 WHEREAS pursuant to Section 9.01 of the Indenture, the Trustee, the New Company
and the Guarantors are authorized to execute and deliver this Supplemental Indenture; 
 NOW THEREFORE, in consideration of the
foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the New Company, the Guarantors and the Trustee mutually covenant and agree for the equal and ratable benefit of the holders of the Securities as
follows: 
 1. Defined Terms. As used in this Supplemental Indenture, terms defined in the Indenture or in the preamble
or recital hereto are used herein as therein defined, except that the term “holders” in this Supplemental Indenture shall refer to the term “holders” as defined in the Indenture and the Trustee acting on behalf of
and for the benefit of such holders. The words “herein,” “hereof” and “hereby” and other words of similar import used in this Supplemental Indenture refer to this Supplemental Indenture as a whole
and not to any particular section hereof. 
 2. Agreement to Assume Obligations. The New Company hereby agrees to
unconditionally assume the Company’s Obligations under the Securities and the Indenture on the terms and subject to the conditions set forth in the Indenture and to be bound by all applicable provisions of the Indenture and the Securities and
to perform all of the obligations and agreements of the Company under the Indenture. 
 3. Agreement to Guarantee. The
Guarantors hereby agree, jointly and severally, with all existing guarantors (if any), to unconditionally guarantee the New Company’s Obligations under the Securities and the Indenture on the terms and subject to the conditions set forth in
Article 11 of the Indenture and to be bound by all other applicable provisions of the Indenture and the Securities and to perform all of the obligations and agreements of a guarantor under the Indenture. 

4. Notices. All notices or other communications to the New Company and the Guarantors shall be given as provided in
Section 13.02 of the Indenture. 
 5. Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as
expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all
purposes, and every holder of Securities heretofore or hereafter authenticated and delivered shall be bound hereby. 

 6. Release of Obligations of Escrow Company. Upon execution of this Supplemental
Indenture by the New Company and the Trustee, CSA Escrow Corporation is released and discharged from all obligations under the Indenture and the Securities. 

7. Governing Law. THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF
NEW YORK. 
 8. Trustee Makes No Representation. The Trustee makes no representation as to the validity or
sufficiency of this Supplemental Indenture. 
 9. Counterparts. The parties may sign any number of copies of this
Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. 
 10.
Effect of Headings. The Section headings herein are for convenience only and shall not effect the construction thereof. 

 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly
executed as of the date first above written. 
  

					
	COOPER-STANDARD AUTOMOTIVE INC.
		
	By:	 	 /s/ Timothy W. Hefferon

		 	Name:	 	Timothy W. Hefferon
		 	Title:	 	Vice President, General Counsel & Secretary
	
	COOPER-STANDARD HOLDINGS INC.
		
	By:	 	 /s/ Timothy W. Hefferon

		 	Name:	 	Timothy W. Hefferon
		 	Title:	 	Vice President, General Counsel & Secretary
	
	GUARANTORS:
	
	COOPER-STANDARD AUTOMOTIVE FHS INC.
	
	 COOPER-STANDARD AUTOMOTIVE FLUID SYSTEMS MEXICO HOLDINGS LLC

	
	COOPER-STANDARD AUTOMOTIVE NC L.L.C.
	
	COOPER-STANDARD AUTOMOTIVE OH, LLC
	
	CSA SERVICES INC.
	
	NISCO HOLDING COMPANY
	
	NORTH AMERICAN RUBBER, INCORPORATED
	
	STANTECH, INC.
	
	STERLING INVESTMENTS COMPANY
	
	WESTBORN SERVICE CENTER, INC.
		
	By:	 	 /s/ Timothy W. Hefferon

		 	Name:	 	Timothy W. Hefferon
		 	Title:	 	Secretary

					
	TRUSTEE:
	
	U.S. BANK NATIONAL ASSOCIATION
	
	as Trustee
		
	By:	 	 /s/ James Kowalski

		 	Name:	 	James Kowalski
		 	Title:	 	Vice President

  

					
	Acknowledged by:
	
	CSA ESCROW CORPORATION
		
	By:	 	 /s/ Timothy W. Hefferon

		 	Name:	 	Timothy W. Hefferon
		 	Title:	 	Vice PresidentJoinder to Registration Rights Agreement, dated May 27, 2010

 EXHIBIT 4.2 

Joinder Agreement 

WHEREAS, CSA Escrow Corporation and Deutsche Bank Securities Inc., as representative of the Initial Purchasers named on Schedule 1 of the
Purchase Agreement (the “Initial Purchasers”), heretofore executed and delivered a Registration Rights Agreement (“Registration Rights Agreement”), dated May 11, 2010, providing for the registration and
exchange of the Securities (as defined therein); and 
 WHEREAS, Cooper-Standard Automotive Inc., a Delaware corporation (the
“Company”), and each of the Guarantors, which was originally not a party thereto, has agreed to join in the Registration Rights Agreement on the Release Date. 

Capitalized terms used herein and not otherwise defined herein shall have the meanings ascribed to such terms in the Registration Rights
Agreement. 
 NOW, THEREFORE, the Company and each Guarantor hereby agrees for the benefit of the Initial Purchasers, as
follows: 
 1. Joinder. Each of the undersigned signatory parties hereby acknowledges that it has received and reviewed a
copy of the Registration Rights Agreement and all other documents it deems fit to enter into this Joinder Agreement (the “Joinder Agreement”), and acknowledges and agrees to (i) join and become a party to the Registration
Rights Agreement as indicated by its signature below; (ii) be bound by all covenants, agreements, representations, warranties, indemnities and acknowledgments attributable to the Guarantors and/or the Company, as applicable, to such signatory
party in the Registration Rights Agreement as if made by, and with respect to, such signatory party; and (iii) perform all obligations and duties required and be entitled to all the benefits of the Guarantors or the Company, as applicable, and
of such signatory party pursuant to the Registration Rights Agreement. 
 2. Representations and Warranties and Agreements of
the Company and the Subsidiary Guarantors. Each of the undersigned hereby represents and warrants to and agrees with the Initial Purchasers that it has all the requisite corporate or limited liability company power and authority, as the case may
be, to execute, deliver and perform its obligations under this Joinder Agreement and to consummate the transaction contemplated hereby and that when this Joinder Agreement is executed and delivered, it will constitute a valid and legally binding
agreement enforceable against each of the undersigned in accordance with its terms. 
 3. Counterparts. This Joinder
Agreement may be signed in one or more counterparts (which may be delivered in original form or via facsimile), each of which shall constitute an original when so executed and all of which together shall constitute one and the same agreement.

 4. Amendments. No amendment or waiver of any provision of this Joinder Agreement, nor any consent or approval to any
departure therefrom, shall in any event be effective unless the same shall be in writing and signed by all of the parties to the Registration Rights Agreement. 

 5. Headings. The section headings used herein are for convenience only and shall not
affect the construction hereof. 
 6. Applicable Law. This Joinder Agreement, and any claims, controversy or dispute
arising under or related to this Joinder Agreement, shall be governed by and construed in accordance with the laws of the State of New York without regard to conflict of law principles that would result in the application of any laws other than the
laws of the State of New York. 

 IN WITNESS WHEREOF, the undersigned has executed this agreement as of the 27th day of May,
2010. 
  

					
	COOPER-STANDARD AUTOMOTIVE INC.
		
	By:	 	 /s/ Timothy W. Hefferon

		 	Name:	 	Timothy W. Hefferon
		 	Title:	 	Vice President, General Counsel & Secretary
	
	COOPER-STANDARD HOLDINGS INC.
		
	By:	 	 /s/ Timothy W. Hefferon

		 	Name:	 	Timothy W. Hefferon
		 	Title:	 	Vice President, General Counsel & Secretary
	
	GUARANTORS:
	
	COOPER-STANDARD AUTOMOTIVE FHS INC.
	
	 COOPER-STANDARD AUTOMOTIVE FLUID SYSTEMS MEXICO HOLDINGS LLC

	
	 COOPER-STANDARD AUTOMOTIVE NC L.L.C.

	
	COOPER-STANDARD AUTOMOTIVE OH, LLC
	
	CSA SERVICES INC.
	
	NISCO HOLDING COMPANY
	
	 NORTH AMERICAN RUBBER, INCORPORATED

	
	STANTECH, INC.
	
	STERLING INVESTMENTS COMPANY
	
	WESTBORN SERVICE CENTER, INC.
		
	By:	 	 /s/ Timothy W. Hefferon

		 	Name:	 	Timothy W. Hefferon
		 	Title:	 	Secretary

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