I think they have an M10x1.25 thread. I also thought that they would be a direct swap, but I can't get the mirror stem to fit in the perch mount. On close examination, it seems that the OEM mirror has a very slightly finer thread.
Anyone get this combo to work? What's the OEM mirror thread dimension?
Did you take off all the silver colored parts? If not, you need to.
Ahh, so after removing the stock mirror stem (one silver collet comes off with that), I also need to remove the lower threaded silver piece that looks like it's integral to the perch? Going to try that right now..