rear window removal 64-66 barracuda

I have done some searches and not found exactly what I'm looking for. I am going to have to remove the rear glass in order to install the headliner the correct way and not look like chit. Any clear write -up's tips and tricks to get it done without any damage to anything. Doesn't look like it was sealed with anything other than the gasket. Good place to acquire the locking strip and gasket on the cheap? Doesn't look like the strip on mine is original. The glass was removed by the PO to have the car painted. However the morons didn't put the headliner in before the glass went back in.