rossyd

Dont really know what the part is called so will try and explain as best I can. The very back window on the passanger side of my galaxy there is a small round "plug" that seals the window shut has come off probabily during transit as I can not find it in my drive way. I was wondering if I am able to buy this part any where or will I need to buy a whole new window? I can't seem to find it anywhere but then again I dont really know what to search for. My local garage has quoted £160 for a whole window. Any help or advice would be greatfuly received thanks in advance