[Yosemite Sam]

First off, YES the transaxle is of NO consequence.

I may be confused, but if you are rebuilding a clutch that is going into a 108, then it is my belief that yes you do need the spring spacer. Otherwise when the clutch is released there will be little or no pressure on the rear pressure plate causing the clutch to slip or not make contact with the rear pressure plate at all.

The 126 does not use the spring spacer, however, the 108 does.