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I just happen to have a 1979 Montauk. If you look carefully at this photo, you can see that the front of the console mounts just where the floor begins to curve up and inward. My console is raised 6" on blocks, but the dimension is the same even if the console sits right on the floor.

http://smg.photobucket.com/user/lgolt...5165080732

The RPS seat is 18" back from the console. That is, the front face of the cushion to the aft console face. I recently just measured this dimension for someone else, so I know it's accurate.