Sniper, I can appreciate your curiosity here...

First, I live about 12,000 miles from Rock Auto and we have an exchange rate problem as well as a freight issue. I have three flywheels here and drilling them is possible if I can get the location right.

Second, the drilling pattern for the external balance is, of course, the same just as you say. I have read on different forums that its different but a lot of people who don't appreciate that fact get carried away there.

The drilling pattern, however, for the fitment of the clutch is clearly different. Could it be that it's exactly 30° different to the 130-tooth flywheel?