Looking for 67mm aluminum discs.. or plexi/lexan?

This sounds downright odd, but the logos for my wheels are missing from the center caps. It's kind of unsightly and to match the outer lip of the rim I would like to just glue some aluminum discs in the holes to give it a finished look. I won't have a logo on them or anything. Can anyone think of a reasonable way to accomplish this? I know a cnc would be ideal but it would be nice to get this done for a decent price.

I have searched for other centercaps on ebay and they would all look pretty goofy. Just plain polished aluminum is going to look best IMO.