This is perfect timing. I am very close to putting the seat covers on my '58 DeSoto. In fact, I slipped a couple of garbage bags over the front seat backs so I could slide the covers over and see how they looked. The seat back is a 60/40 split. The 60 side went on easily, the 40 side was extremely tight and I didn't get it pulled down all the way. I wasn't ready to install the covers, I just wanted an idea of how hard it would be to get them down over the seatbacks. It looks like this vacuum deal is the cure for my ills. Thanks