Hi, I just came across your request and was wondering how you were doing with your bushings? I used polyurothane bushings for a Z31 and modified them to fit a 280ZX rear cross member. It worked out great for me.
So sad that nobody is producing door seals for the 2nd generation Z. Of all the 280ZXs made from 1979-83 that are still on the road, I would bet that they all need door seals by now - mine included.