It was from a ford. I just measured and took a used one. I didn't want to spend around 2000$ which, if I remember right, was the price for an after market company that makes tanks to fit. I kept the skid plate/metal under case it came with and bought a diesel filler neck used some pipe from the...
I cut the spare hanger and jammed a 32 gal tank in it. I also put the old 13 or so gal tank under where the PTO pump used to sit. Rigged a fuel switch to toggle between tanks. The sending unit from that 32gal tank worked cause it was 12v but I had to bend the steel float arm around for fitment...