The dimensions Fitz posted are the same as mine.
Note my picture is of the port tank with the poly replacement.
The interior is square with the top and bottom of the tank, the exterior (outside) is angled. The starboard tank will be a mirror of the port one.
The fill tube and vent are forward, the sending unit in the center and the outlet in the rear.
Remember to add "ears" to each end to fasten to the floor.
http://www.wellcraftv20.com/communit...nk+replacement