Mine kept popping out after I installed them and the arm rest, I tried heating them up a bit and stretching them out, but one broke. I just pushed the clips into the panel until they popped in and then screwed in the armrest, but I'm guessing I may have been doing it wrong. need some new clips now...
After struggling with one of the new aftermarket clips, (which are different than the factory originals), I decided to just have the top of the clips tack-welded into place. I could not bend then enough to get them to go in. Was afraid they would break. The tack welding worked great and the armrests line up perfect.