I need help in picking the best quality door skins for my 75 K5. I have redone the whole blazer, but the bottom corners of the doors are rusting after two years. I've looked at LMC, Cheyenne, etc. but I have no idea who offers the best quality. I got all the fenders and bedsides from chevy, they only have the doors that I would have to cut off the window frame, and I don't want to do that. Thank you for the help!