To keep the stock heater control cable in your Scout II and have a clean install you will need this 90° valve. You can make it work if you already have a heater core with 90° bend outlets but you will still need a hose reducer. On our projects we prefer just to keep it clean and simple and use this valve that already has the correct size outlets.
Tip: If your Scout had straight heater core outlets your heater box is shaped slightly different than that with stock 90° bends. So its not as simple as swapping in a new heater core.