Stop in for a cup of coffee

Hey guys, good morning.. quick question.. On early b-bodys (Not sure on a-bodys) the window regulator has 2 studs that go into slots in the bracket on the bottom of the window on each side of the bracket are 2 like cloth/fiber washers held in with a star washer... Anyone know what those washers are made of? Or what a decent replacement would be? Nylon? I lost 2 of mine :(
P.S. i was careful.. and put everything in boxes as i took it apart this time and still lost ****.. it's a gift :)