Pretty sure that the black was originally painted on and that is why no decal is available. http://mmb.maverick.to/threads/comet-gt-hood-stripe-info.71512/
Easy to tape that one out, and then shoot the black using SEM Hot Rod Black - HR010 The SEM product is amazing to work with.
I bought vinyl from a local shop and used it on the hoods of my Mustang and Comet. Here's a pic of it on the Mercury.