Whether or not there's different threading in the mirrors?
I started shopping for mirror extenders (photo below) and I've found that some are "regular threaded" and some are "left-hand threaded" and all of them say "check to make sure of your thread requirements before purchasing" so my question is, how the heck does one determine whether or not the threads are what they are? You can't just look at the things, can you?
I may just drop by the dealer, and ask the guy to ask the technicians who assembled the thing exactly what they are, and what I need if I'm going to get mirror extenders.
They'll know if they're 8mm or 10mm, and whether one is left, or both are regular.
I hope.
Anyway, this is what I'm going to be getting: