On my gas Ultra Supreme, I gave 5 screws that hold down the doghouse. 2 on the firewall, 1 on each side and 1 at the inside end. They are just square head screws. Feel along under the edge of the carpet and you should be able to find them.
If you take the doghouse off, there is a gasket along the edge of the firewall. I did not have to replace it as it was still in good shape.
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