The only thing that's different is the bracket that attaches to the block. The front and rear Avid mounts are only the part that bolts to the subframe. And only the front mount is different between 1G AWD's and the VR-4. They'll work fine as long as you use the correct front bracket. I guess it doesn't matter since you have a manual rack, but you would have needed a 2G PS pump.
Also, I dig the clearances written on the girdle /ubbthreads/images/graemlins/smile.gif
Nice crank.
Quoting BoostedAWD91:
the 1G rear and front mounts are different than the Vr4's.