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Thanks for all the replies. My friend has one question: where is the spigot measured to determine whether it is a small 97mm or a large 99mm spigot? Is it at the base or the largest point where it enters the engine case? As the bike was built in 10/75 he may be at the point of change over where BMW was using up what small spigot clinders were left in inventory.

Thanks again!

Hank
'72 R60
'95 K75S

The largest part that enters the engine case.

A 10/75 build should, theoretically, be the larger opening. Unless BMW was using up spare cases left over from the '75 models which ended in August 1975.

Kurt in S.A.