Thine spray mask may be procured through any one of thine local autorefinishing purveyors. A multitude of suppliers sit waiting by thier monitors just waiting for a googlesk type individual to find them, and purchase their wares.
(Can NOT think of the name of the magazine that comes to me. AutoRefinish Mart, or something like that? Comes quarterly. Several local supply houses tout it as better than sliced bread. )