good vortec valve cover gasket?

[rebel1mcelroy]

Needing a good valve cover gasket for 062 vortec heads with tall after market aluminum covers. Running fel pro blue silicon ones now and have to stretch them to glue on then go through tech and they fall off! Was thinking about running some laminated cork gaskets that are 5/16ths thick, but cant find a part # or even where to order them. Any ideas? Thanks in advance!

[istock11m]

You can buy gasket material in a bulk roll at the parts store. Cut it out and go. Oreilly's part # is 3008 for 1/4" 18x36 felpro sheet.