There is a man at The Filling Station...name is Steve. Good guy. He and I last year discovered Steele was running some weatherstrip through an extrusion die which was too small and Steve got them to correct it. If you talk to him, tell him I said hi. He'll remember working on this, probably. What they were running was 3/8" thick and that won't quite do it. What Steele calls 1/2 is really 7/16, but it works. Here it is:
https://store.fillingstation.com/detail/70-331/Chevrolet_194755_TRUCK_DOOR_EDGE_SEAL_THIN_12.htmlIf you have a truck that hasn't been abused or which hasn't suffered a lot of damage and your doors still fit correctly (from what I can see yours do), then you need the thinner seal product. Anything around 11/16" is just too thick unless your doors are basically not in very good nick. And even then they'll stand proudly away from the cab if the rubber is too thick. In 1978 I bought from GM the actual weatherstrip for the 1952 Chevy 1/2 ton truck. It was 1/2 inch, but it wasn't really very soft. I asked the guys at Steakley Chevy about it (the dealership) and they said "well, that's been here in our back room for about 20 years or so. Probably lost some of the springiness sitting there waiting for a buyer, but it ought to be ok." It worked and it sealed those doors up tighter than Scrooge's wallet, but I always felt it could have been a bit less thick. GM no longer carries that part. Two years ago I contacted them (home office) and a nice lady spent probably 30 minutes looking for part numbers that might cross-reference. At one point in the 80s, GM had a program to sell certain after-market parts which were good enough to qualify as genuine GM replacement parts (Steele made some of them), but that program is gone now. Anyhow she and I never could find anything similar, so I tried the thicker stuff and absolutely could not make it work any way going. It is the stuff all these vendors (except for The Filling Station) are selling. Good luck.
