Transmission hump for a stick car

Looking for some info on dimensions for the factory floor kick out (hump) for a four speed. Being my car is a nostalgia prostock build im going to make an aluminum tunnel that is removable. my question is from the door sill rocker area to the edge of the hump how far is that? Ill make a one off tunnel when done with that attaches to a Dzus rail around the opening but I'm trying to get as much room as possible.

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