I am working on my 74 RR/GTX. RM21U4G, loaded PS,PB,Cruise,AM/FM,A/C, Rear Defogger,Stripe delete, with full vinyl top, Manual Sunroof, Rally Gauges with Tach, two data plates, also has Power Windows, Vin says its a coupe, and the coupes back windows are not suppose the roll down just the...