72 Swinger disc kit availability.

off the top of my head i think that SSBC might be the only folks who make a SBP kit that fits 14" wheels

https://ssbc-usa.com/products/a153
in the notes they have a caveat: will work with some 14" and most 15" wheels, but they provide a spec chart. if your rallye wheels are original it's likely they'll fit, but if they're after market it's 50/50 on that.