1990K5 - I was just going through the for sale items and noticed that you're searching for 73-75 weatherstripping and door caps for your conversion. I'm doing the same conversion and it took me FOREVER to find these parts so I thought I'd save you the trouble I went through. First of all. all the weatherstripping will cost you $450 for new pieces. Two places carry them that I know of, one has a better quality inner header seal. The upper and lower door caps are also new, but I don't recommend the lower door caps (the caps that are just above the door handles) because they are plastic and cheap looking. Hunt around for originals from a junkyard. I got mine at "Vintage Chevy" in Fremont, CA for $20 (510) 651-5874. They mostly deal with pre-73 Chevys but do have a few things past those years. I will post the names of the companies that have the weatherstripping on Monday since I'm at work and don't have that info with me. Send me an e-mail if you want more info on the swap you're doing.