It may very well be a 1978 G-Body only problem. I own a '78 & that's most likely why I remember the issue.
I think the spindle diameter is smaller on whatever early years are affected. I also own an '87 G-Body that the P/O installed drop spindles on & 1" lower springs in the rear. It wears 17" wheels & just looks right. In my opinion, the 17" wheel is the best looking large diameter wheel for the G-Body wheel openings. The taller wheels look too big & begin to look like a donk.
Good luck & please let me know what you find out.
I think the spindle diameter is smaller on whatever early years are affected. I also own an '87 G-Body that the P/O installed drop spindles on & 1" lower springs in the rear. It wears 17" wheels & just looks right. In my opinion, the 17" wheel is the best looking large diameter wheel for the G-Body wheel openings. The taller wheels look too big & begin to look like a donk.
Good luck & please let me know what you find out.