Indeed, the right mirror has left hand thread. I installed the Rizoma Spy-R mirrors but I couldn't find replacement bolts and I didn't want to cut them in case I wanted to go back (for whatever reason) to the stock mirrors. I tried with plastic trim holders but they weren't firm enough, so I used some spacers that came with the Rizoma mirrors, washers and the stock bolts to keep the reservoirs in place. It's not the cleanest solution but it works fine. I went to a dealer and ask for the bolts but they didn't have them so I let them be, maybe you can order a spare set and cut the originals but not sure how much thread will be left since it doesn't go all the way up. Here's a pic of how mine look.