Technically there would have been four main wheels..
- MK1A US (two spoke)
- MK1A (three spoke, basically the same as corolla twincam wheel out here)
- MK1B
- Momo (in super edition 1 and 2)
All but the Momo were available either twimmed or bare; and for the MK1B there were two different trim styles.

Japan MK1A trimmed. different hornpad to the AE82 TWincam...

Japan MK1B Trimmed.



Japan MK1B vs Aus, and a closeup of the different trim finish points. I have no idea why they were like this..!
afaik, only Japanese and USA MK1B's had 'MR2' written on the hornpad - it was not a SC specific thing.