Hello, I am in process of installing new door glass in a 72 chevelle. There are 2 black plastic buttons in each window one at each end, I was able to remove and replace both in the pass window but broke both in drivers glass trying to remove. I am unable to locate these in any catalogs and am unsure what they are called, anyone know where these can be purchased and what they are called? Thanks.

They are called glass bearings in the Fisher Body Manual.
Unfortunately I cant seem to find a source for them.
Maybe a salvage yard. Wish I could be more help.

Thank you!!

I bet if you went to a body shop or an auto glass place they would have some extras.