Greetings Bart, well, to your question..... the RS's came factory with the mirrors attached on the fairing. BUT the throttle/brake body, and the left side clutch perch assy, on the 1100RS's is the same as what was used on the earlier K1 series. According the the parts listings for the K1 mirrors the threaded locking nut is 8mm(part #4)
There are 2 different mirror part #'s.
#1 Left : 51 16 2 308 577
#2 right: 51 16 2 308 578
The parts listing does also note: If you are looking for a taller mirror, we recommend the mirrors from an R1100GS. Does not apply to all models that this mirror fits. Be sure the parts that the mirrors mount to (master cylinder/lever assemblies) are the same before ordering.
