Rally dash redo
Those gaskets had adhesive on them. Proof? When you pull the gaskets from turn lens tubes in the housing, you often find the paper that covers the adhesive still there. Gasket is so captured in this location that the adhesive wasn't needed. These red and green lenses are quite captured too but could fall away and do need a light capturing gasket. That adhesive at other gaskets is likely dead today. Paper just falls off, no sticky under it. So transferring gaskets from one place to the other wasn't like Dorothys ruby slippers, just what I needed. I've had to remake a few of these gaskets from similar foam I had on hand too. Anyway...
I applied a little GE clear silicone adhesive with a tooth pick and laid the gaskets in it. Just enough to hold things in place during assembly.