I am taking a break from the drivetrain work to work on the dash and firewall. My question to those who still use the factory wipers is is there a rubber insulator of some sort over the drive tab on the vaccum motor before it gets bolted to the driven mechanism on the firewall. It appears to be too loose without something in there and would wear rapidly without a plastic or rubber insulator. My wagon came without a vaccum motor but I picked one up at a swapmeet. I can't find anything listed in any online catalogs.