ok first up me and the SIP web sight just don't get on!
when I took my wifes LXv 125 to bits the nut that held the driving pulley
looked like R121850260 (the one with the lip as shown in the image)
the clutch bell nut looked like PI486326
I thought the driving pulley one was the one off use with the lip.
Thoughts?
(sorry about the double picture)