On my 60 and 61 starliners those seals just slide off the bottom and then just push or actually pull the new one back up into the channel. They are tight to fit so I usually pull up on the top end while holding some tension on the lower end to slightly stretch the seal. That makes it easier to install. I used WD-40 on one several years ago and the seal would slide down in the channel while driving down the road? I avoid using anything to make the rubber slide easier now!
Scott...