Back Glass Rubber
I believe this is what I got from jcwhitney for my 63 dart back glass.
Weatherstrip with Separate Lock-strip, (Style E) 1/16" Body Panel Thickness Roll ZX812497Y $32.99 They also have the lock strip.
Chrome Locking Strip for Weatherstrip Roll ZX812569U $15.99
They also offer samples if you call the number listed.