The old mirror was removed exactly as per “how to” instructions as found on the 75&ZT Owners Club forum. They are excellent …. the only addition I would add to those instructions is to use some silicon spray on the clips to ease re assembly.
I compared the electrical resistance between the old and new elements on the mirrors. The old mirror had a resistance of 27ohms compared to the new mirror of 11ohms so nearly 3 times the power.