How much window felt/mohair needed '65 Barracuda?

The glass channel run material is very similar to the velcro material. You will need approximately 42 inches of the narrow channel run and the rear channel run would be 24 inches. The front vent window frame appears to be lined with metal liner with the stainless bead on each side. If you should like to remove the channel, then the length would be approximately the same, but you would need to know the width and depth of the channel to find one which would work correctly with your car.