Hi
Kit spur is 83 and kit gearing (33:23 on the slipper adjust end) equals 2.6.
WRT the adaptor, it is the layshaft itself that is modified. You need to turn down the centre that sits in the spur gear to fit the ID of associated spurs.
To be honest though, it looks like the new black spurs from Schumacher are stronger than the original white ones.
Enjoy
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