Just a couple image from the 96 catalog. I will add more later. The MX, SST, Pro and Rebel were all the same exact size and geometry. But the Rebel was TriMoly I think and the other 3 4130 frames. I believe the Pro, SST and MX all had closed looptail, while the Rebel was not closed in 96.
The SST and MX appear to be almost identical. Perhaps one had a mild steel fork or different rims. But for the most part the same exact parts group.