Are 65 66 valiant rear window seal same?

Yup, 66 one year on the rear glass...I would check your parts car Jay....they are pretty stiff and most are tough shape. I tried to remove one from a parts car it it crumbled...but I might know of a good used one in a junkyard near you at Rohners....but the car is hidden under trees which is good cause its possible the sun didn't cook it too bad.....bad thing is now with he snow and cold you would probably have to wait till spring to take it out now.