And the operation went much more easily than anticipated. It was a piece of cake actually. I made a few cuts around the edges with a hack saw, and started peeling the plastic off with a screwdriver. Then, slid the guts right into an NOS 70s chrome cover. They clearly used the exact inside dims of the old chrome covers when they designed the plastic ones. It's a perfect, snug fit. Droppin in to a BaCHbird tonight.