I'm sure that's from a Cub Cadet. It's got the 10hp Kohler sticker, it has that larger more squarish look than a Sears tank, the proper sediment bowl/fuel petcock, and then there's the yellow.
I thought I would sell it to someone who needs a tank. It can be boxed up and shipped. Maybe I should post it in the for sale section as a Cub Cadet fuel tank.Possibly, but as junkman points out, other models used it as well. What are you thinking you want to do with it?