I looked at various places for replacement mirrors . 1A auto made it the easiest to find the part ship out. An easy install and my 2002 avalnche is like new.
Replaces
Unfortunately, not knowing your exact vehicle I cannot really guide you however, if you do see your vehicle listed in the fit list, then you do have a harness connector. Chevy/GMC vehicles all have a specific length harness on them. Yours would not be any different off the assembly line. The connector may be clipped to the door shell. If you are still having a hard time locating it, please check on some GMC forums or check YouTube for installation videos for guidance.