Basic mechanic Q o' the day: install hub dust caps - ever had one that was hard to seat properly?

It's the Dorman aftermarket garbage and no thermal contraction is going to make them fit. Might as well spit on it and put some hair around the hole.

Go to pick n pull and rob them off a fifth ave or similar. The dodge dealer still stocked them for a fifth ave last I checked, and possibly early Dakota's, but they were running out.