I know there are a few budding prop builders out there. Here is a link to a chap selling some cvrt wheels. Ok so they are not WW2, but they really look the part as they are solid and have a solid rubber tyre.
Mind you they are heavy....
If you go to a scrappy, you can usually pick up a couple of identical space saver tyres for cheaps. They're probably lighter, and look pretty good when painted up.