Single row ball bearing - Fitted to the outer of the two driveside mainshaft bearings in the crankcase on all SOHC engines, both International and early Manx. This is the correct C3 (loose tolerence) type, from top quality manufacturer RHP.
Feb 2021: Sorry to say, that just like all other SOHC RHP C3 (loose tolerance) bearings, these are now obsolete and we are down to our last handful of bearings we have been able to obtain.
Once this small stock has gone I fear we will either have to supply RHP non-C3 type or those from a lesser brand.