If you have an idea of various screen sizes, you should be able to find one to fit -- or that could be trimmed slightly -- from the list at
Brando.
I prefer their standard (or slightly matt) WorkShop protector over the glossy UltraClear one. Currently using an UltraClear after having a standard, and the dust and fingerprints and reflections are driving me mad. The Brando have a mild adhesive on them, a polyethylene glycol type wax similar to that used on Post-It Notes. Brando service is very prompt, if you're wondering.
Edt: should have said, I used the matt protector on an HVGA screen, and there was little image degradation -- noticeable, but very little. Not sure what it would do to VGA.