There are differences in the input shafts (30 vs. 36 spline) and the out put shaft diameters also. Saginaw 605 (with the round top cover) was a "downsized" cheaper power box that used the same output shaft as most manual boxes. The Saginaw 800 power box used a larger out put shaft diameter. I have a whole 5 gallon bucket full of pitman arms, but an original '69 - '72 GP one, wow thats hen teeth. Kind of like finding a first gen Monte Carlo or a '73 Chevelle with manual steering.
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