Ok finding more stuff every time I start digging. Found 4 NOS 65/66 sill plates I bought in 1974. were not in a package. I forget if they were when I got em. need some cleaning up. Did a little digging an according to Marti Auto Works they are different from Converts to reg Mustangs. ?? I don't remember any difference.
Yes fastback and coupe are shaped differently
Then had the stickers for them. Middle one is original from 6S2378. What years are they used? # plates from 2007
The far right ones were the focus of a thread a site back - used during 1966 - Could use a pair I think. Don't think I've got a pair set back for the wife's car.
Far left some 65 and and the majority of 66
There are reproductions so you will want to check that also (of the sill plate labels) depending on your plans
Yes sure plenty of us have boxes of stuff hanging or hiding out around our garages