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                                                                  EXHIBIT 10.8.3

                             [FORM OF SERIES C NOTE]

                              LINCARE HOLDINGS INC.

                       9.11% SENIOR SECURED NOTE, SERIES C
                             DUE SEPTEMBER 15, 2005

No. C-[_____]                                                           [Date]
$[_______]                                                    PPN: 532791 A# 7

                  FOR VALUE RECEIVED, the undersigned, LINCARE HOLDINGS INC.
(herein called the "Company"), a corporation organized and existing under the
laws of the State of Delaware, promises to pay to [ ], or registered assigns,
the principal sum of $[ ] on September 15, 2005, with interest (computed on the
basis of a 360-day year of twelve 30-day months) (a) on the unpaid balance
thereof at the rate of 9.11% per annum from the date hereof, payable
semiannually, on March 15 and September 15 in each year, commencing with the
March or September next succeeding the date hereof (except that no interest
payment shall be made on September 15, 2000), until the principal hereof shall
have become due and payable, and (b) to the extent permitted by law on any
overdue payment (including any overdue prepayment) of principal, any overdue
payment of interest and any overdue payment of any Make-Whole Amount (as defined
in the Note Purchase Agreement referred to below), payable semiannually as
aforesaid (or, at the option of the registered holder hereof, on demand), at a
rate per annum from time to time equal to the greater of (i) 11.11% or (ii) 2%
over the rate of interest publicly announced by Bank of America from time to
time in Chicago, Illinois as its "base" or "prime" rate.

                  Payments of principal of, interest on and any Make-Whole
Amount with respect to this Note are to be made in lawful money of the United
States of America at the principal office of Bank of America in Chicago,
Illinois or at such other place as the Company shall have designated by written
notice to the holder of this Note as provided in the Note Purchase Agreement
referred to below.

                  This Note is one of a series of Senior Secured Notes (herein
called the "Notes") issued pursuant to a Note Purchase Agreement dated as of
September 1, 2000 (as from time to time amended, the "Note Purchase Agreement"),
between the Company and the respective Purchasers named therein and is entitled
to the benefits thereof. Each holder of this Note will be deemed, by its
acceptance hereof, (i) to have agreed to the confidentiality provisions set
forth in Section 20 of the Note Purchase Agreement and (ii) to have made the
representation set forth in Section 6.2 of the Note Purchase Agreement.

                                 Exhibit 10.8.3
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                  This Note is a registered Note and, as provided in the Note
Purchase Agreement, upon surrender of this Note for registration of transfer,
duly endorsed, or accompanied by a written instrument of transfer duly executed,
by the registered holder hereof or such holder's attorney duly authorized in
writing, a new Note for a like principal amount will be issued to, and
registered in the name of, the transferee. Prior to due presentment for
registration of transfer, the Company may treat the person in whose name this
Note is registered as the owner hereof for the purpose of receiving payment and
for all other purposes, and the Company will not be affected by any notice to
the contrary.

                  This Note is subject to optional prepayment, in whole or from
time to time in part, and to mandatory offers to prepay, at the times and on the
terms specified in the Note Purchase Agreement but not otherwise.

                  If an Event of Default, as defined in the Note Purchase
Agreement, occurs and is continuing, the principal of this Note may be declared
or otherwise become due and payable in the manner, at the price (including any
applicable Make-Whole Amount) and with the effect provided in the Note Purchase
Agreement.

                  Payment of the principal of, and interest and Make-Whole
Amount, if any, on this Note, and all other amounts due under the Note Purchase
Agreement, is guaranteed pursuant to the terms of a Guaranty dated as of
September 1, 2000 of certain Subsidiaries of the Company.*

                  This Note shall be construed and enforced in accordance with,
and the rights of the parties shall be governed by, the law of the State of
Illinois excluding choice-of-law principles of the law of such State that would
require the application of the laws of a jurisdiction other than such State.

                                   LINCARE HOLDINGS INC.

                                   By:
                                        ---------------------------------------
                                   Name:
                                          -------------------------------------
                                   Title:
                                           ------------------------------------

--------------
* This paragraph must be removed at such time as there are no Subsidiary
  Guarantors.

                                       2

                                 Exhibit 10.8.3<PAGE>   1
                                                                     Exhibit 4.1

THE SHARES OF STOCK ISSUABLE UPON THE EXERCISE OF THIS STOCK PURCHASE WARRANT
HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR THE
SECURITIES LAWS OF ANY STATE. THE STOCK ISSUABLE UPON THE EXERCISE OF THIS
WARRANT MAY NOT BE SOLD OR OTHERWISE TRANSFERRED, IN THE ABSENCE OF AN EFFECTIVE
REGISTRATION STATEMENT UNDER SUCH ACT AND LAWS OR AN OPINION OF COUNSEL
REASONABLY ACCEPTABLE TO THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED.

                             STOCK PURCHASE WARRANT

         FOR VALUE RECEIVED, Celeris Corp., a Minnesota corporation (the
"Company"), hereby grants to Wells Fargo Bank Minnesota, N.A., solely in its
capacity as Escrow Agent (as defined in the Settlement Agreement and, in such
capacity, the "Investor"), on this 18th day of October, 2000, the right, subject
to the provisions hereinafter set forth, to purchase Five Hundred Thousand
(500,000) shares of the Company's Common Stock, $.01 par value (all shares of
the Common Stock of the Company being referred to as the "Shares"), at the
exercise price (the "Exercise Price") of $4.00 per Share.

         This Warrant is subject to the following provisions.

         1. EXERCISE PERIOD. This Warrant shall be exercisable by Investor, in
whole or in increments of 100 Shares or more (provided, however, that in the
event an Investor owns a Warrant for fewer than 100 Shares, such Investor may
exercise all, but not less than all, of the Shares underlying such Warrant),
subject to the terms of Section 2, beginning as of the date hereof, and
Investor's right to exercise this Warrant shall expire five on September 1,
2005. Upon the expiration of this Warrant, Investor shall return the Warrant to
the Company.

         2. EXERCISE PROCEDURES.

                  a. Subject to the terms herein, this Warrant will be deemed to
have been exercised when the Company has received the following items (the date
that all such items have been received is hereinafter referred to as the
"Exercise Date"), at its offices at 1801 West End Avenue, Suite 750, Nashville,
Tennessee 37203 or at such other address of which it notifies the holder hereof:

                           i. a completed Exercise Agreement, in the form
attached hereto as EXHIBIT A, executed by the Investor;

                           ii. this Warrant; and

                           iii. the Exercise Price, in immediately available
funds.

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                  b. Certificate(s) evidencing the Shares being purchased will
be delivered to Investor promptly after the Exercise Date, and the Shares so
issued shall be deemed for all purposes to have been issued to Investor and
Investor will be deemed for all purposes to have become the record holder of the
Shares as of the Exercise Date. If the Investor exercises the Warrant for less
than all of the Shares issuable hereunder, the Company shall issue and deliver
to the Investor a new Warrant of like tenor and date for the balance of the
Shares issuable hereunder.

         3. ADJUSTMENT OF EXERCISE PRICE, CONVERSION PRICE AND NUMBER OF SHARES.
To prevent dilution of the rights granted under this Warrant, the initial
Exercise Price shall be subject to adjustment from time to time as provided in
this Section 3 (such price or such price as last adjusted pursuant to the terms
hereof, as the case may be, is herein called the "Exercise Price"), and the
number of Shares obtainable upon exercise of this Warrant shall be subject to
adjustment from time to time as provided in this Section 3.

                  a. SUBDIVISION OR COMBINATION OF SHARES. If the Company at any
time after the date hereof shall, by stock dividend, subdivision, stock split or
combination or other reclassification of securities (any such action herein
referred to as a "Reclassification"), change any of the securities to which
purchase rights under this Warrant exist into the same or a different number of
securities of any class or series, this Warrant shall entitle the Investor to
acquire such number and kind of securities as would have been issuable as the
result of such change with respect to the securities which were subject to the
purchase rights under this Warrant immediately prior to such Reclassification,
and the Exercise Price shall be appropriately adjusted.

                  b. NOTICES. Following any adjustment pursuant to this Section
3, the Company will give written notice of the new Exercise Price and number of
securities to the Investor.

         4. NO VOTING RIGHTS. This Warrant will not entitle the Investor to any
voting rights or other rights as a shareholder of the Company.

         5. REPLACEMENT. Upon receipt of evidence reasonably satisfactory to the
Company of the ownership and loss, theft, destruction or mutilation of this
Warrant, and receipt of indemnity reasonably satisfactory to the Company, the
Company will execute and deliver a replacement to this Warrant, representing the
then current identical rights granted herein. All costs of such replacement
shall be borne by the Investor.

         6. EXERCISE, TRANSFER. This Warrant is transferable by the Investor in
accordance with that certain Stipulation of Settlement regarding Summit Medical
Systems, Inc. Securities Litigation, Civil Action No. 97-558-JMR/FLN (the
"Settlement Agreement') and in accordance with the Securities Act of 1933, as
amended (the "Securities Act") and any applicable state securities laws. The
Shares have not been registered under the

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Securities Act or the securities laws of any state. The Shares may not be sold
or otherwise transferred, in the absence of an effective registration statement
under such act and laws or an opinion of counsel reasonably acceptable to the
Company that such registration is not required. The Shares, when issued, shall
contain a legend substantially similar to the legend contained on this Warrant.

         7. SATURDAYS, SUNDAYS, HOLIDAYS, ETC. If the last or appointed day for
the taking of any action or the expiration of any right required or granted
herein shall be a Saturday, Sunday or legal holiday, then such action may be
taken or such right may be exercised on the next succeeding day not a Saturday,
Sunday or legal holiday.

         8. GOVERNING LAW. This Warrant shall be governed in all respects,
including validity, interpretation and effect, by the laws of the State of
Minnesota.

         IN WITNESS WHEREOF, the Company has caused this Warrant to be signed by
its duly authorized officer as of the date first above written.

                                  CELERIS CORP.

                                  By: /s/ Paul R. Johnson
                                      ------------------------------------------

                                  Title: Vice President and Chief
                                         Financial Officer
                                        ----------------------------------------

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                                    EXHIBIT A

                               EXERCISE AGREEMENT

         The undersigned, pursuant to the provisions set forth in the attached
Stock Purchase Warrant, hereby agrees to subscribe for and purchase ____ shares
of the Common Stock, $.01 par value, of Celeris Corp., a Minnesota corporation,
and herewith makes payment in full therefor at the price per share set forth in
said Stock Purchase Warrant.

                                    --------------------------------------------

                                    Signature:

                                    Social Security No.: _______________________

                                    Date: ______________________________________

                                    Address:

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