49 CFR § 568.5 - Requirements for intermediate manufacturers.

Each intermediate manufacturer of a vehicle manufactured in two or more stages shall furnish to the final-stage manufacturer the document required by 49 CFR 568.4 in the manner specified in that section. If any of the changes in the vehicle made by the intermediate manufacturer affects the validity of the statements in the IVD, that manufacturer shall furnish an addendum to the IVD that contains its name and mailing address and an indication of all changes that should be made in the IVD to reflect changes that it made to the vehicle. The addendum shall contain a certification by the intermediate manufacturer that the statements contained in the addendum are accurate as of the date of manufacture by the intermediate manufacturer and can be used and relied on by any subsequent intermediate manufacturer(s) and the final-stage manufacturer as a basis for certification.