Re:
AMP didn't offer XTR on a bike until 1997, prior to that the top bikes were XT.
XT was the parallax design, 95 XTR was the M910 style which looks very similar to the XT Parallax hub, from 96 XTR was the M950 design which will take the AMP disc adapter.
The adapter has an inside diameter of 53.975mm where the hub flange sits, so if the hub you have is smaller than this size it should be OK.
AMP also used to supply thin washers to get the caliper to disc position right.