I bought a set of the U.S. Car Tool frame connectors for my 69 rr.After several days trying to get things to line up,I gave up and called John.
He asked if I had oe floor pans and I told him yes.I also told him that the car had been abused for most of its life.He explained to me that after 30 years of flexing ,things might not line up correctly and even though I had cut on mine heavily to try to make them fit,he purchased them back with no hassle whatsoever!
I've since purchased their driveshaft loop and the fit is perfect and no problems there.
John