When I bought my roller GT, I was told it has a rear out of a 03 Mach 1. Upgrading to a Fab 9" now and need to sell the 'Mach 1' rear. Is there any tell-tale signs it's truely out of a mach? It has the 3.55 gear, but I've read the mach's have same rear brake cages as a cobra? These look to be...