They're Yahama style, M10x1.25 with counter threading on the left (I think).
http://zeromanual.com/index.php/Common_Modifications#Third-Party_Mirrors
Brian, thanks for the link.
The internet is beginning to convince me that Yamaha and Ducati usually have left-threaded
right-hand-side mirrors, opposite of our left-threaded
left side. Yamaha-style extenders are working for people here, but maybe not Yamaha-style replacement mirrors.
My FXS definitely has a left-threaded left-hand-side mirror - with a year-old, very-clean, centered, vertical crack that's only mildly distorting. It completely slipped my mind that I would need to replace it before inspection deadline, which is Wednesday. I had no luck today at the local Yamaha and Ducati dealers.
hEY if anyone in the greater Boston area would like to swap left-side mirrors with me for a couple days, I would be super duper grateful.
(I want to give
http://www.rahns.com all my business, but it is too far to go on a work day. If they even have one.)
