the rubber and glass come out as a unit, get freind to help by staning out side so glass not hit floor,get inside work rubber lipp slowly,it is probably dry,place hnd flat on glass pusng out,roll rubber toward center as you push,if it seems stuck check for sealant inside and out,after 60 years things get changed and dry ,new rubbers should be available,highly recommened,install headliner,then replace glass,it goes in using sash cord,you can see videos,or ask more .good luck,not responsible for breakage.