Installation went well on a 2003 Sierra. You must take your time removing the old mirror so as not to damage the bracket that holds it. As with other comments, this mirror lacks the mounting clips on the base plate to hold the wires going to the electronics. It is a pity that the manufacturer does not integrate this function into the base plate during casting. Also I had to clip two wire connectors to hold them in place and would recommend one of these to ensure they are secure before inserting the mirror. Distortion and magnification are acceptable given the high OEM cost and that kind of money for a 16 year old truck. worked for me
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