Back as I promised.

I´ve found the following:

The MK2 16v Group A rally car uses a flywheel with partnumber: 027 105 271 R
This is the 027 105 271 SP series Flywheel with modifications.
The flywheel in the MK3 Group A is a 037 Partnumber.

So my conclusion would be that you have a lightened Flywheel from a US version of the MK2 Golf. But this is just a hunge
So in the end I'm not really helping you but this is all I could find

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