It looks like its made to fit , are all of the Mustang tanks rear fill ?? , one of my requirements is to be a side fill , like thru the fender tub , or just behind the tub on the bed side , as the rear bumper that is on the truck is a wrap around step bumper , not the smaller chrome dress bumper like is in your picture , so exiting the rear is not a option at this point , unless i change to the chrome dress bumper and add a receiver hitch to the frame for towing a trailer , since i will be actually using the truck as a summer driver and occasionally pulling a dirt bike/ATV trailer