why no paint on vinyl roof cars

Think of it this way; back then, the Chrysler Corporation put vinyl roofs on tens of thousands of cars. If they could save $20 (time and materials) on each car by not painting the roof, that is a lot of money saved. Same deal with the reflectors in 1969. 68s had side lights, but 69s just had reflectors. Chrysler found a loophole in the law, and went with reflectors in 69. Each car with a reflector saved wiring and bulbs. Maybe only a savings of $5 or $10 per car, but when you sell a zillion cars.... The government shut down the loophole, and 70s Mopars had side lights.