just a thought outside the box here,
contact the company, Holland or Mechanical
they were together many years ago, but as I understand the owners got crossways over the water delivery system, so they separated.
both brands are very good setters.
however, they might have pictures, booklets, sales brochures of tank holders made for different tractors over the years.
first we had a one row Holland with the tank hanging off the front end of a TO-35 fergy. later we had a two row Holland with a tank on each side of the little fergy, both units had different tank racks, but they were factory made for that type tractor.
I still have a one row mechanical with the tank support bracket attached to the frame of the setter. this unit is much easier to hookup and work with.
worth a try, who knows you might hit pay dirt.
Nothing ventured, nothing gained