I wouldn't want to make a windshield for a '58 Plymouth either. But if you can't buy a replacement window I don't see any other way than making a replacement window. I guess you could take up knitting. In the case of a rear window, I don't see why you couldn't use tin or fiberglass to replicate the contor of the stock window. I never parallel park my car. Why do I have to see out the back window? Have to check with the board on this one.