IIRC some of these were based of Crosley frames. Challenge rule reads:
Vehicles may either retain production frame rails or equivalent unibody structures, or they may use a tubular frame provided they retain the production body.
If the vehicle uses a tubular frame, then modification of production exterior bodywork is only allowed provided the end result is substantially similar in general appearance to the original vehicle. Sweet box flares are specifically allowed.
If the vehicle retains production frame rails or equivalent unibody structures, then exterior bodywork modification is unlimited, provided no safety rules are violated. Production frame rails or equivalent unibody structures may be modified to alter a vehicle’s wheelbase.
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