I then put a small amount of self leveling urethane at the bottom of original mount base for sealing purposes. Found some billet aluminum round stock on ebay that was almost the exact size I needed. All I had to do was drill the center hole(went .483-485" as it's basically just a spacer, you could also go a little bigger). The aluminum dimensions are 2.5" diameter x .75" long. After that's done, I filled the outer space ring with some high temp sealant for keeping dirt/dust out etc...