I also bought a fuel tank fitting from Pantera Performance Center. Dennis and Adam have been around a while and figured out how to do things. I searched for a fuel tank fitting suitable for the Pantera and found a few, but Dennis and Adam have a fitting that they use. It has an integral sealing washer and the nut & sealing washer spin differently than the body, making assembly and positioning a snap.
I've also finished rebuilding the seat tracks with cad-plated tracks and new plastic roller wheels. The tracks are awesome but don't slide as well as I thought they would. I think once I put the seats on and put them in the car, they should slide just fine. I've started rebuilding a clutch slave cylinder and will post pictures and seal part numbers once I get it finished. The slave cylinder bore was pitted and rusty so I honed the inside of it with a brake cylinder hone. If the rebuild doesn't work well, I'm only out $20.