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I had kinda the same question. I bought an z6 clutch/flywheel from a buddy and put it on my a6. Havent tryed to put the starter on yet, is it gonna fit?
The flywheel/pressure plate needs to be matched together, however the clutch splines can vary. The 88 trans had a oddball spline count. But yes you can swap flywheels from any D15/D16.