If you find anything better please let me know too. I'm searching for the bezel artwork myself.
I have tried to get some people (who advertise their ownership of an original Galaga cab on their site) to send me a picture, but had no luck. If I get a reply at all it's that I should just buy an original reproduction. Thing is, I'm not restoring an original, but something with different dimensions.
Twobits.com sells one for $100, but with shipping to the Netherlands I'd probably end up paying around $200. Actually it's a pretty cool item if you are really restoring a cab (with tempered glass and silkscreened art and all).