Are the threads for the mirrors a non standard size?? I tried to use one of my mates mirrors and it would not fit, I have seen Yamaha Adaptors on ebay, some are to convert from left hand to right hand thread and some are for 8mm-10mm, I am unsure which ones to get, but think it is the left hand thread ones as the thread on my mates mirror looks the same size.. Any info would be much appeciated.