I've briefly looked into this. The ratios of a M56 are different to the M90 so I'm not sure if the syncros will also be a different size, but it would certainly be worth a look. I am planning to get hold of a M56 (even a broken one) to strip down and compare at some point. I actually want to swap some of the M56 gears into the M90. Let me know what you find out.
Craig
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