I purchased a NOS in-the-box 1969 3004809 A Body 383-only Pitman arm attached pic. I have attempted to document the differences with the 2835745 1968 A-Body 'regular' Pitman. Although they span different years, assumption is only the part number changed in 69 (i.e. 1968 A-Body 383-only Pitman is same design). It is small sector shaft opening.

I clamped both Pitmans on edge of plywood board 'clocked' identically.

383 pitman is about 3/8 inch shorter in height, and 3/8 inch less in depth or extension from steering shaft.

Also note yellow paint on the part - perhaps to identify as a 383 version?

Hope this helps