Cleaned up the inner wall of the transit duct and sanded down the outside edge for a better fit with the back plate. Fits very snuggly inside the back plate so I'm not sure if I need to secure it or not. Match drilled the #40 holes in the outer wall of the filter housing to the back plate to #21 for nut plates and #8 screws. Installed the nut plates and temp installed on the fuel servo. All seems well except securing of top screw on filter housing due to close access. Need to get a shorty #15 Torx bit reach the top screw