Have you contacted Titan or Transfer flow to see if they still have one sitting around for your truck or one of their dealers do?
I decided to go with a portable transfer tank that I only use when I am towing. It sits in the bed of the tank and hold 25 gallons. It comes with a pump and battery power cables. I remove it when not towing.
I did contact them. Titan for instance, because that is the one I would prefer, said no. And it seems none of the dealers actually ever had any stock of this item, they were all drop shipped because I found it for sale on numerous websites, ordered it, was charged for it, then was contacted saying they didn't have it even though it said "in stock"
*SOLD* TRUCK: '04 F350 Lariat SC SB 4x4 *SOLD*