For 67 remote, there will be a visible hole in your upper interior door frame if you dont plug it with the remote. The vinyl door panels do not cover that hole like a 68 panel will. And 67's did not come with a passenger door mirror.
THANK YOU for saving me from a bad mistake. It's been too long since I looked at my PHS docs, the car had both left and right hand VANITY mirrors. Oops
Still like to find a better quality remote mirror, but maybe they don't exist since most GM parts dealers show back ordered or discontinued.