MY '79 VW Rabbit got bent badly at IRP a while ago. It has been replaced by an '84 ITB VW GTI. Were I to build the car to the ITC spec line - 1.7 w/CIS, 13' wheels, solid rotors - would this be a genuine C car, or were there chassis fabrication/chassis material differences between the baseline Rabbit and the GTI? Thanks for your time and input.