Wow, great work. Those prices came down a good amount since i first searched them a while ago.
You should talk to them about gear conversions. The chains are all the same (4t60) from 93 up i'm pretty sure but the 92 and lower have a diffrent thickness. The gears are the thing that change. The gears available are 33:37, 35:35, and two others that yeild lower FDR numbers. Slappin 33:37 gears in a trans with a 2.84 diff will give you a 3.18 FDR with a 3.06 diff it will give you 3.43, and with a 3.33 diff it will give you 3.73 FDR.
It'* a shame they don't do limited slip diffs but they do have a high strength chain.