direct from the NHTSA website:
http://www.nhtsa.dot.gov/cars/....html
HOW YOU MAY APPLY FOR PERMISSION TO IMPORT
Your signed application must include, at a minimum:
Your name, address, phone number, and FAX number. Vehicle identification – make, model, model year, VIN or chassis number, engine number, date of manufacture and mileage. Location where you will store the vehicle in the United States. Statement describing use on the public roads, if intended. If on-road use is requested, identify the Independent Commercial Importer (ICI) that will modify the vehicle to bring it into conformity with the requirements of the Environmental Protection Agency. Basis for the application. Attachments: Photographs – ¾ frontal, ¾ rear, interior, odometer reading and special features (if appropriate). Document from manufacturer or recognized historical source, identifying total production (production verification). Proof of insurance conditioned on limited on-road use (not more than 2,500 miles accumulated in any 12-month period). Identification of vehicle’s: Technological significance – You must identify (be specific) the technology, engineering, and construction features of the vehicle that are advanced and of an unusual nature not commonly found in motor vehicles manufactured in the same time period; or Historical significance – You must identify the historical significance of the vehicle. If a person of historical significance owned the vehicle, you must submit proof that this person owned the vehicle. If the vehicle was the first or last vehicle of a particular model, you must establish this through the manufacturer’s documentation or, if this is not available, through a recognized historical source. If the vehicle was "one of a kind," you must establish this also.