1964 Dart

'64-'66 Darts all (except wagon + convertible, duh) use the same backglass and gasket. '63 is not the same, it has a smaller backglass and different gasket.

Windshield and backglass gaskets have been difficult to get lately because one of the major suppliers (most vendors bought from) either went out of business or suspended production. That was about a year ago and there were several threads on the topic on here; I don't know what today's situation is. Doesn't really matter; you can get the 2 pieces you need (#W42 upper and #W43 lower backglass gasket for '64-'66 Dart) from Gary Goers; contact info here.