There were two possible knobs used on your tractor. The two styles had different thread sizes. There was the round version 'A' and the UFO looking shape version 'B'. This is the style 'B'. If you need the style 'A' then please click here.
The actual UFO shape is no longer available but this round one has the correct threads and will screw right on in the same spot as the UFO version and work just fine.
