I did a parts search for you and came up empty handed. Sorry.
Here are the part numbers though.
Bicentenial stripe kit:
Complete cab
D6TZ-1320000-A
8' bed w/ tool box
D6TZ-9920000-A
8' Bed w/o tool box
D6TZ-9920000-B
Like bucks77ford said, if I did locate any it would be strictly a crap-shoot on whether they would still be any good. The stripe kits had a shelf life of about two years.