Are you trying to match a “Year Correct” control or does that matter to you” The “square” control that came out in the 1960’s works much better than the rounded one in outbdnut’s link. Either one will work, any old year motor. The square control was redesigned inside in 1979 to use pre-assembled cables (Type 479), another big improvement, and still works with older motors.
Here’s an example of what a square control looks like. (Pre-1979 cables)
