This is completely up to you but I discovered that the rubber kit that you buy for the doors on a M&S 80 will fit perfectly for doing the ad glass on the curved A-38 glass. I'm not talking about the window rubber, I'm talking about the rubber door kits which are pop riveted onto the backside of the doors that press up against the pump when you close the doors. It lays down right in that channel and its wide enough to protect the glass. I don't even think I had to cut anything but the correct lengths. Good luck Dennis, it should work just fine.
Goober