Buy a 71-75 C10 reman box and PS pitman arm, hoses for the same, pump for same from your fav FLAPS-should all bolt up using Tony's plate or a REZ kit, Captfab also sells the frame plates. You'll need brackets to bolt up your pump.
Used boxes are kinda a crapshoot unless you know the truck its coming off of-many wrecks damage the box.
