Hello Ken, I have mounted the ZX mirrors on my 75 with just a few challenges. Seems I used the original ZX brackets (the ones inside the doors) in reverse. Left on right, right on left. I had to remove a little material to get them to sit just right. I just mounted the RH side and matched the LH side to it as far as location.
I have yet to connect the remote control as I am pending a console replacement. I had to buy 2 sets to get all them both to work correctly electrically.
Assuming you have the doors apart, nothing that can not be done in an afternoon.