Rear Bumper Bracket Gaskets

On my 1972 Dodge Dart Swinger, removed the rear chrome bumper today to have a dent repaired during the winter. The chrome bumper is held by a 2 brackets which are mounted with 6 bolts to the body of the car. Between the brackets were black paper like gaskets for each bolt hole. Does anyone know where I could find replacement for these paper gaskets?
I have 6 of the white foam ones from DMT. As far as I could tell they were not used originally on my '75. So, I did not use them. They are yours if you PM me where to send them.