Replacement window guide channel felt.

This is the kit I and others have used.

MN3104 - 1967-74 A-Body; 1966-70 B-Body Front Door Glass Channel Seals

The felt on plastic slides up and down with the glass and the plastics with metal pins keeps the glass from drooping in the rear.

As for cat wiskers between door glass and door body, I used a kit like this.
MA9845 - 1967-69 Dart Convertible 8 Piece Factory-Style Door Glass Weatherstrip Set