The top threads are stripped and I can't get my mirror in. : [ How could I fix this? Does anyone know the part number for the clutch lever mount / mirror socket part?
Sometimes these get stripped when someone tries to screw the right side mirror into the left side or the left side mirror into the right side.
Yamaha does righty-tighty on the left side and lefty-tighty on the right side. Sort of like old Dodges that had right side and left side lug nuts.
On your bike, one option may be to use a thread restorer-------the kits are sold at Sears and other hardware and tool stores, or your local mechanic should have a set.
Not necessarily cheap if you will use only one time, but I have a set in my toolbox for both standard and metric and they were definitely a good investment if you want a complete toolbox.