49 CFR 551.65: What if a foreign manufacturer changes its name, address or product names or marks?

(a) A foreign manufacturer must provide written notice to NHTSA of any changes in its name, address or marks, trade names, or other designations of origin appearing on its products.

(b) Foreign manufacturers should mail notices to the Office of the Executive Secretariat, National Highway Traffic Safety Administration, Room 5221, 400 Seventh Street, SW., Washington, DC 20590. To avoid delays, the agency suggests using express mail services.