The Nissan Path

Hey folks I'm new to the whole forum stuff but I need a little help redirecting my pathfinder out of the garage. Just got her up and running but had a quick fix done to the rear floor panel under the seats done some years agal and now am looking to replace the floor section under there. Where would I find a floor panel like that? Mine rusted out and was just covered up with sheet metal and like tar or something. I need to take that out and get it back to the original floor