60-66 Suburban rear barn door weatherstrip sources?

[Chuck78]

I am the proud new owner of a fairly clean 1962 GMC panel truck!!! Wanted a panel or burb for many years, time to retire the workhorse daily driver 1989 350TBI rustbucket burb... Anyhow, needed major carb work, some minor rust spots fixed (hood sides and fender bottoms mostly), but is real clean. The other immediate issue is that I have no rear door weatherstrip on the truck at all. LMC has nothing that I can find in their 60-66 catalog for this. I figure it's gotta be a hard part to track down.

Where on earth do you get this stuff? Does it just slip over the edges of the panels or something, or are there holes in mine that are filled in where the weatherstripping snaps into?

I'm gonna have a lot of questions, glad to have found this, the stovebolt site, and the 60-66 GMC guy sites! Normally I'm a 70-81 Camaro guy, among other hobbies....

Thanks!