The bracket also bolts into the frame rail into a rivnut. It might be tricky to install the rivnut but should be possible with the right tool. PST sells bushings for the traction bar. That’s about the only place to find them. They’re poly urethane.

I’m right in the middle of replacing the 69 rear with the correct 67 dual traction bar setup. Waiting for springs from Eaton. My 67 bird was a 326 4 speed and had both bars originally. The mounting studs and rivnuts look to still be usable