Right, on the inside only, and I don’t see why the doors would be any different on the GMC of that year. Ya'll listen to Alvin about the pre-curved anti-tattle strips/inner seal. I have access to a machine shop so I ended up making a special bender that held the strips flat while I bent them. If you just try bending them by hand they will kink and the crimp that holds the fabric strip will open up.
Also, depending on how original you want to stay or how patient you are, the original staple holes in the garnish can be reused. I clamped the strip to the garnish using padded wood blocks to keep from bending or scaring the parts. Then I transferred the holes one at a time by putting a small punch mark from the back side, thru the original holes using a 90° scriber tip from inside the garnish. Then I drilled the anti-rattle strip one at a time re-clamping them with pre-drilled staples loosely inserted for alignment. After all the staples were located and drilled I set them with a pair of channel lock pliers that I had ground the jaws on to fit around the garnish.
I bought staples from two different vendors and neither were the right size. So, back to the machine shop and I made a bending fixture with the proper leg spacing to match the origninal holes and knocked out a hand full of my own staples.
It looks absolutely original, but it’s a lot work and that’s why most just pop-rivet them and the window run channel and have done with it.
DG
