I'm pretty sure the fasteners are different from 1970 to 1971, but I don't have photos. All the Cuda's I've seen that have their original floors do have fasteners in the manual foot pump area. So I agree, on a power washer car (1970 or 1971) the fasteners are different, and they are there because all the cars that I've seen have the two holes there, and the factory must've put fasteners there to fill the holes to keep the water out.

Good luck!!!!!!!