72 Swinger disc kit availability.

Sounds like a job for the stock 72-and-earlier Kelsey Hayes front disc setup, which had SBP hubs. I'm sure you'd be able to collect all the parts for less than the price of a fancy new aftermarket setup.

I have the original KH setup on my 72 swinger - no power booster and a 1" bore Master Cylinder. I'm always amazed at how great those original brakes work.