I bought a used set of grey seat belts that I was putting in and I noticed that the foam? seal that goes between the plunger and the door jam is torn and missing in spots. I can't find this for sale on 'the google', so is this replaceable as an individual part? If not, does anyone have some ideas? I was thinking that maybe I could go to the hardware store and get some 1/4" or so thick foam type of seal and cut it to fit.

Thanks guys.
Howard