[Walt Fricke]

One must separate the clutch disk diameters (215 vs 225) from flywheel or assembly diameters (which means the ring gear, as it sticks farthest out). The design of the 901 (or, if you will, 2.0) flywheel left room for a larger disk inside. This required an entirely different flywheel and pressure plate, plus the separate ring gear, but they all fit in the same three dimensional space.

Hence all the interchangeability. Of course, if you get off the beaten path you start dealing with other differences - the splines on the trannsmission mainshaft, or "push" versus "pull" pressure plates, and related throwout bearing and actuating mechanism issues.

But Burint doesn't have those to deal with, it seems.

Walt