Whether a truck had levers or cables depended upon the PTO supplied by the body builder. Back at the time of the truck in question the only option was levers. Push/pull cables didn't become available until the late 50's/early 60's. An easy way to tell is the lever units had a rod shifter with an eye bolt attachement for the floor lever controls. Hydraulic pumps of that ere were all lever controlled. PTO's made for cable shift came with a side plate that had a 3" or so long shift lever that the cable attached to with a Bowden pin.
For this truck I'd bet on levers and between or just in front of the seats was a normal location.
But, as always, after all these years anything could have been changed.
