Driveshafts (2)

Your first shaft is a 108 wheel base 904 or 4 spd - 8 3/4 rear
Or 8-1/4" rear, which is what I have.

Your second shaft is a 108 wheel base 727 - 8 3/4 rear
Nope, it's for a 110" wheelbase Challenger with an A833. :D