Hi Dallas
Not sure exactly what you're after, but I get my MAAA numbers and custom lettering done by a vinyl sticker guy at Blacktown NSW. He uses only the best materials and he is very fussy and very reasonably priced.
For custom decals, I make my own using Inkjet decal paper available from hobby shops. You need to spray them with estapol or clear to make them fuelproof though.
Cheers
Warren