Need correct Pitman arm

I have it backwords. Sorry. My manual 72 box is small spline. (I was saying big spline cause where the steering shaft goes on the steering box has bigger splines)actually its where the pitman arm goes on the box is small spline. I understand now. So I'm going to find an idler arm and centerlink to go with my 72 manual box and pitman arm. Please correct me if I'm wrong