My aftermarket mirrors both use right handed thread at the mirror with an adapter for the LHS. Maybe you could just use an adapter to change the thread from left handed thread to right and use the OE clutch perch?
If you are worried about the height difference compared to the RHS, you can use an adapter for the RHS that does not change the thread (right to right) to give you the right height for both mirrors.
Jarrah
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2000 TT-R250M-
Spoiler
Ported & polished, 73mm bore, Wizeco piston, US header pipe, FMF Q4, #150 main jet, #52.5 pilot jet, throttle stop screw adjusted, larger snorkel, GYT-R air filter, NGK Iridium spark plug, 14/51 gearing, NOS +
Both my mounts and mirrors are left hand thread.
I have broken the left hand side, clutch mounting clamp, the replacement I have used from an o/e ttr has a right hand thread.
I would need an adapter to change this to left hand thread.
All the adapters I can find are for changing left to right.
Kenny.
