There are 2 types I know of- early flat type (for the old coil spring clutches) and the later one with the ridge round it (for diaphragm clutches).
The later ones are either made by RHP in UK (good) or are a Jap bearing- JTN? (a POS). One of the latter I trashed in 3 days.

You DO get what you pay for...
I won't buy them now unless they say `Made in England'.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
