16 CFR 455.3: Window form.

(a) Form given to buyer. Give the buyer of a used vehicle sold by you the window form displayed under § 455.2 containing all of the disclosures required by the Rule and reflecting the warranty coverage agreed upon. If you prefer, you may give the buyer a copy of the original, so long as that copy accurately reflects all of the disclosures required by the Rule and the warranty coverage agreed upon.

(b) Incorporated into contract. The information on the final version of the window form is incorporated into the contract of sale for each used vehicle you sell to a consumer. Information on the window form overrides any contrary provisions in the contract of sale. To inform the consumer of these facts, include the following language conspicuously in each consumer contract of sale:

The information you see on the window form for this vehicle is part of this contract. Information on the window form overrides any contrary provisions in the contract of sale.