Bench seat location

I've got a '74 Scamp and trying to figure out where to drill holes in the floor to install to OE bench seat. The PO replace the floor and I dont know where the holes would have been. Im not concerned from side to side as I can just center it. Can anyone perhaps take a measurement for me? I think from the rear would be easiest to measure as it is flat where the rear seat sits up on the "ledge" or raised part.

Thanks guys.