mine in the same case as some race cars so I was thinking about applying some race number decals to the 3 empty roundels. Right now I'm using photo editing software to see how certain fonts would look and trying to decide what race number to use.

Here are the two latest fonts I'm considering. Still not sure whether I want the numbers to overlap the door bottoms. The 2nd font is shorter so it centers better in the roundel without overlapping the door bottom.