Take the opportunity to inspect wiring, lock mechanism, window regulator, etc. Lube items as appropriate. Also, a GREAT time to replace incorrect / mismatched panel hardware and upgrade plastic inner door releases to aluminum versions. I like the Sonderwerks offerings...
www.sonderwerks.com/product-page/billet-oem-plus-interior-door-handle-set-with-or-w-o-glow-dot-porsche-911-912
Auf Wiedersehen, plastik, und hallo... Aluminium.
Classic9 Leather Shop offers an interior fastener / hardware kit. Admittedly, it's $92, but it's 370 pieces organized in a plastic case. Wonderful, especially if you own / work on multiple cars. After working on all my cars and some of my friends' cars, I'm getting ready to buy my second one.
www.classic9leathershop.com/interior-screw-kit-911-964-993-928-924-944-986-1970-1995