Does anyone know where i can find the drain rubber for the vent window assembly? I replaced the glass and rubbers, rechromed and polished SS on the assembly. But when I was putting everything together I noticed a drain rubber (what's left of it) on the bottom of the assembly. There is a metal plate that holds a rubber/gasket piece (approx 5") that has a notch for the vent arm to regulator and a square nipple (looks like a drain). I've called all the major suppliers, no luck! I know it's a minor piece but I figure I've done alot of work to overlook a simple rubber. Any guidance is appreciated.