Depending on the brand they either had a cap that pushes in through the hole from the backside that has a lip that keeps it from pulling through, or it had a cap with gripper fingers or indented edges that snapped in from the front.
Center bore hole size in the wheel determines what size cap you'll need, and a lot of old no longer in production wheels have center caps that are almost impossible to find. In this case you'll have to find something from a different manufacturer that has the same hole size
If you search for "Mag wheel center caps" from various current wheel manufacturers, summit, Ebay, etc you can also find new push in caps in various diameters and various styles (bullet nose, rounds nose, column, domed, etc) and you may find something that will fit the hole size in your wheels
There are also center caps that have five ears on them, with a screw hole in each ear. These are easy to find in the aftermarket in several different diameters to cover the center hole in the wheel. You just have to drill and tap the wheel for screws yourself to use that style cap. I've drilled a bunch of old slot mags to take the bolt-on caps, and use #10-32 stainless allen head button head screws to hold down the cap. Basically copying what is used on most American Racing wheels like the Torque Thrust wheel.
the caps for those are a small cap. your wheels will need to be drilled and tapped to mount them. Do a search for crager caps as those are the ones i know about.
On older cars where the front hub stuck out, we would use tall hats on the front wheels and flat covers on the rear wheels where the rear axle didn't stick out...
The caps that push in the hole and hold in by plastic fingers tend to fall out and get lost when hitting bumps in the road...
American Racing Wheels used to use a lot of caps with 5 little screws like Eric mentioned...
I've got some broken off little screws I need to drill out and replace... If going that route, I would put RTV on the screw threads so they don't corrode weld to the aluminum wheels, and stay tight, yet still unscrew easily if wanted to...
They are called center caps and are readily available. There are plastic snap-in versions, metal versions that push in from the backside, and metal or plastic versions that screw to the front. Your call.
My old man has had Ansen Uni-lug Sprints on his car since 1970. His had the chromed 'pot metal' snap-in cap (from the front). His were pretty beat, so he painted them silver and just ran with it. Several years ago, I bought him a set from AKH Wheels mentioned above. Super nice guy, great packing and shipping. He'll help you identify what you have, all the markings should be on the back side of the wheel.
If you have Ansens, Fentons, Indy or ET; the caps won't be the cheapest. If the wheels are rare (say original ET's or Carroll Shelby branded ones) it may be better to SELL them, and then buy a more common set of wheels that have all the parts
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