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Here is a picture of the floorboard from my 42. Should be the same 42-48 with most 48's being made out of aluminum instead of steel.
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Here is a shot of my 46 with the floorboard in position.
Yep the bumpers fit into pre pressed holes. I second getting a seal kit too. Just a note.. you might find the holes in the floor have "flogged out" over the the year and may have to fit bigger screws or get some large speed clips for the floor side of the set up.
GB