I put a large sector power steering box in my '69 Charger, and used the Moog K7076 pitman arm for '73-'79 B-Body with power steering. The '65-'70 B-Body pitman arm, K780, is discontinued. The K7075 pitman arm for '73-'79 B-Body with manual steering has the small spline. If the K7076 works with the large sector box, why wouldn't the K7075 work with the small sector box? The earlier years use the same pitman for power and manual. What am I missing?