Mike,
Not that I know of.
Simple to make though, get a piece of safety glass from you local hardware (the size you want), a cheap fiberglass kit, with the type of 'glass' you want, coarse, fine, mesh, mat, etc. A bunch of cheap paint brushes and your ready to go.
Cut the sheets as big as you want, cover the glass with a coat of resin,add 'glass more resin, more 'glass, more resin, etc until you have it has thick as you want. Let it dry, peel off the sheet and your ready to go. Use a puddy knife or razor blade to clean the glass up and do it again. Heck in a month you'll be molding your own Cobras
DV