original style black vent window adjuster access plug

I'd really like to find an original style black plug for the hole below the vent window that fills an allen screw access hole for vent window adjustment. Th originals were flexible rubber/vinyl, not the hard plastic replacements now on the repop market. I just need one, but would take a couple extras if available. They were always interior paint colored. I have a few green ones if somebody wanted to trade.