I remember from when I converted mine, the only real difference was that the pivot shaft was slightly longer on the clutch pedal version, and there was a very small brace welded into the hanger bracket.
It's been twenty five years, but I remember this because I saw that brace and I thought I would be crafty and just replace the pivot pin, but when I did that, the hanger bracket flexed and it caused the clutch pedal to bind without the brace.
I have a set from an F body and I was hoping maybe the pedals were the same and she could just use the F body pivot pin and pedals in her auto bracket and fab a brace.
Pedals and parts are a lot more available on the Internet than they were in Central Missouri in the 90's...