Need help identifying a flywheel

[AlpineEdirty]

I have a flywheel that was given to me by a friend for my s52 swap. He says it was off of an m42 but thats about all he knows.
It's a singlemass and the ring gears is like the older m20 ones. the clutch side is about whopping 3/4" (2cm) thick and weighs as much as the twinmass. It had a 228mm clutch bolted to it when he took the tranny off...
Is this a m20 singlemass? or may be 325e or 528e flywheel? any ideas?

Thanks

[MR 325]

Definitely not from an M42, they are dual mass.

Post a pic, we can easily answer the question.

[AlpineEdirty]

sorry pics are a little blurry

[Myster-E]

That's a m20 i flywheel

[MR 325]

Actually it looks like a single mass e flywheel.