2nd generation cuda question

My black car is a factory right mirror. i'm restoring another one that is a factory right mirror car. In 67 the mirror (either really) is pretty worthless due to the position of the mirror back on the door, where in 68-9 it was moved to the vent post and much more useful then the 67 location.

67-68 - right mirror is code 537
68 - right mirror is code G31