Antique motor vehicle: includes every automobile, truck, motorcycle or other motor vehicle, but not a reproduction thereof, manufactured more than 25 years prior to the current year, which has been maintained in or restored to a condition which is substantially in conformity with manufacturer's specifications. A vehicle which has undergone substantial alterations from its original specifications and appearance, or has had its horsepower or dimensions changed, shall not be eligible for an antique license plate pursuant to this section.

Street rod: shall mean a vehicle, the body and frame of which were manufactured prior to the year 1949 and which has been modified for safe road use, or a kit car which resembles that of an original pre-1949 vehicle and has also been modified for safe road use. For the purposes of this section "modified" means, but is not limited to, a substantial and material alteration, or replacement of the engine, drive-train, suspension or brake system or alteration of the body which may be chopped, channeled, sectioned, filled or otherwise changed dimensionally from the original manufactured body.