Crew, My near perfect 97 Yukon 2 door had the mirror shakes. I did the wrong thing and bought the cheap one on the Jungle site. It shook as bad as the one on my truck. I then paid about 3 times as much and bought a genuine GMC from these folks: https://www.gmpartsstore.com/ and the shakes are gone... it's like a rock (sorry I couldn't help myself).
I have no affiliation with the above mentioned source. Did I learn my lesson, probably not but I'm getting closer.
I have no affiliation with the above mentioned source. Did I learn my lesson, probably not but I'm getting closer.