Cant get a pic, but the descrip will jog your memory if you seen one before.
Looks a bit like a deepsump 750 one as far as fins go
2 inches deep
7 1/2 inches x 9 1/4, includes bolt bosses, 10 bolt,
Drain bolt is not underneath, but tucked up facing to rear.
Looks like a symetrical rectangle, except 2 corners are beveled.
O ring for a seal.
Reason I want to know, looks like it will lend itsself well to being part of a custom tank for a cb750..