The surface that would normally come in contact with your servo on #7336 was machined down 0.075". Then I removed what would be the top servo mounting hole (wasn't needed so I machined it off....although you could leave it if you wanted). I measured the location of the round nub on the original plastic tab mount and drilled a 0.100" hole approximately 0.200" deep in that location on the new part. A 0.100" ABS pin was glued in the hole and machined down to the same height as the original piece. Then I screwed them to the chassis and drilled a hole on each side of the under tray in the correct location.

Piece of cake

I did this in our machine shop but it could have just as easily been done with a Dremel.

I'll take a couple more pictures so it makes better sense.