If these are the wheel covers you are referring to they are called the Sport Wheel cover. They were a $45 option back in the day.
If they are, flip them over and you will see several coarse threaded screws on the back side. Remove those and the center section comes out. The back piece/trim ring is stainless and can be polished up. The center section colors vary by year. 1970 was a dark gray and 71 -73 was an argent gray. I used Eastwood Argent Wheel paint on the center section. Don has the replacement tri-bar pony center medallion if you need them.
Great info. I have 6 of the wheel covers and would need some of the pony centers, thank you so much!!!!
