My '63 4X4 has a box from a '77 4X4, along with the rest of the P/S components, and it has the arm the sticks out perpendicular to the frame. It also has the '77 front axle assembly too so I'm not sure what all it would take to retro something on to yours,
Scott

Scott Ward

2 1948 1.5-ton Loadmasters
The red one and The snow pusher
1 1950 3100
1 1955.1 Chevy 6500
1 1954 Chevy 6500 2-Ton
1 1955 1st Series COE 5700
1 1963 K20 (454)
1 1964 C10 (350)
1 1951 1.5-ton Dump Truck
1953 and a 1956 Ford F800

Raising a teenager is like trying to nail Jello to a tree!