Looks like someone put in a steel floor and then cut part of it out. It can be straightened and a patch welded in. As crusty looking as it is, this thing is very solid, not rusted through. Looks like the same someone cut holes in the tailgate for taillights, maybe. The lower right corner of the tailgate needs some attention. I bought it with the intention of using it on my '29 RPU, but it's been sitting in my barn for the last three years. It's 21 inches front to back, 47 1/2 wide.