Your going to struggle with this one Sean......seem to recall there was an M21 advertised some week back on one of the forums........here.just found it, from 6 week ago on Facebook marketplace link -
I know many people ramble-on about how strong a M22 'box is........but it still has the same basic construction as an M21......it just that angling of gear teeth is 'kinder' when it used in high output engines.
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