The description of the hose-kit on Summit ( brg-925102 ) says indeed;
"Connects GM power steering pumps to 1979-97 Mustang rack and pinion."

You need to have a Saginaw steeringpump with this kit with it's fitting on the back of the pump.
The Federal (type) pumps are different and the hosekit ends are angled wrong for these pumps aswell.