Matt300ZXT

I'm looking at a 39 Buick 4 door that's been lowered on air ride and is very hot rod. The engine runs, sounds good, and the car will drive but he said it has trouble going into first and reverse. A previous owner (he's kind of a car flipper) had a new clutch put in it so I don't know if that may have something to do with it. I have tried to Google and YouTube and search on here and maybe I'm just not wording my search parameters right or something, but figured maybe someone knew of a walk through online of how to do it so if I trade my truck for it, I'd at least be able to cruise around the neighborhood until I did a couple more things to it.

This is probably a long shot, but thought I'd see if anyone had a glass kit, or even the rubber seals/weatherstripping for a 39 Buick Special 4 door sedan?