The MPC calls this out:
Without vinyl roof RH C9ZZ-6551726-C; LH C9ZZ-6551727-C
With vinyl roof RH C9ZZ-6551726-D; LH C9ZZ-6551727-D
I asked a friend who has about 20 of them (69 Mustangs that is) and confirmed that they are very hard to come by.
A shortcut (gasp!) is to cut the vinyl off before it turns up the metal piece that the drip rail latches on to. Not an easy place to see. But of course, not concours. I would think also that it would be tedious and difficult to not break through to bare metal, and all the bad things that come with that. I would keep looking, but what does one do when they can't be found? Unless it was a 428 car it would be crazy to buy a donor just for that. But now if there is a great interior with clock and tach, and a San Jose firewall pad, and... OK I'll stop