Anyone have a pattern for an undercap?

[Destichado]

I'm looking for something like this:
http://www.varmouries.com/cru_04.html

I'm sure it's a simple pattern to make, but I'm not much on re-inventing the wheel. If anyone has one, I'd be most appreciative.

Thanks!

[Dragos]

It looks like a semi truck hubcap with sides that should be easy to figure out a pattern. a friend of mine and I where joking about this very same thing.

Dragos