ET IV Wheels center caps question

[HawkX66]

I'm getting ready to clean up my ET IV wheels. I've always had plastic push in from the front style center caps. I wanted to go with more secure and metal push in from the rear type, so I picked up some original caps. They're 3.22" like they're supposed to be, but they seem to be a pretty tight fit. Anyone else running them that can tell me about their caps and how they fit? Maybe the push in from the front style wheels are different from the push in from the back style? Here is one of mine and a pic of my car with the wheels on it just before I started my resto.

Thanks.