A set of four polished aluminum baby moon hubcaps.
They would look great chrome reversed wheels by Pegasus.
This is made of solid aluminum and is not hollow on the back. You may have to route out the back so it would seat over your wheel detail, like lug nuts or hubs. If ti's easier, grind the wheel detail off to a flat surface.
Measures 3/8" diameter.
Four aluminum pieces by Parts by Parks, 1/25 scale.