You are driving yourself crazy!
Don't worry so much about fit. It is a direct replacement for either the original round Hobart Built Motor or the slab sided Emerson motor. The bolt patterns are the same and will mount up to your original pump mounting plate without a problem. Once Hobart sold KA to Whirlpool, they also got the plant that built the dw motors and WP is not in the motor building business so they had Emerson build them as they always had.
The difference in the motor that your machine has is that the Hobart motor had a centrifugal start switch in the motor which started it in the proper direction. The replacements use a motor start relay which should be part of the replacement kit. It is a simple hookup to do. That is the reason for the "extra" wire. It will attach to one side of the drain solenoid and everything you need to do it will be in the kit.
Hobart,on the other hand, while still using the same style motor in the SR24 machines as the motors in the KD18 thru 20 series machines, does not use the start relay but rather a start capacitor which gets wired into the circuit. Hobart also gets way, way more money for the motor kit so stick with the Whirlpool sourced motors. Emerson also builds the motor for the Hobart machines and tags them with the Hobart part numbers.
The stock number from repair clinic is their stock number for the kit and references the OEM WP number.
You will not go wrong with the replacement. If you feel so inclined, I have more than a dozen motors available for those machines that came out of working units.
And rebuilding your old one is actually easy. The bearings are standard fare and should be available from any bearing house or even Hobart. Let me know if you want the part number.
If you do go for a new motor kit, DO rebuiold your old one so you will have a working spare.
