I have found several new sources for parts and knowledge about the E9 coupes.
I have yet to find anything critical that the car needs that isn’t still available. There will be something, I’m sure I’ll have to do without, or update with a more modern part, but an advantage of having a pretty complete car is that I’m not needing some hard to find bit. I did find that in spite of having a panel with A/C controls in the trunk, the car never did have air conditioning. It’s good that I have the panel, since apparently it and the switches are hard to come by. One retailer sells a full kit for installing A/C, but it’s an eye watering $2500. Still, I had expected to update the cooling from R12 if it did have it and in Texas, it’s almost a necessity if you want to drive your car in the summer. Starting fresh with new and rebuilt components will ensure trouble free use, I hope.
I’ve added a long list of links to the links page, some are not working, I’ll check them and delete the bad ones over time.