That is exactly what I have determined. I ordered the GXV160UH2A12. Stepped Crank (1" down to 7/8"). With the engine raised up with the spacer, from the diagrams, Snapper added three washers between the Blade Hub and the Crank to lower the Blade Hub to compensate for the deck spacer raising the Blade Hub.The Honda GXV160UH2A1AS is the Snapper spec engine. The Northern Tool engine has the same crankshaft. It is actually not 'tapered' but stepped from 1" to 7/8" as you will notice your drive belt pulley is 1" ID and your blade adapter is 7/8".
The Snapper spacer is required to position your blade correctly. Without, it will be hitting the deck lip. You will also need a new flywheel brake cable (from Snapper) as it needs to be longer.
The Northern Tool should work just fine, but do your local businesses a favor and shop local.
The Throttle and Blade Brake (on engine) are on opposite side of their respective handle mounts so the cables have to cross over, which explains the longer Brake Cable. I order both the Brake and Throttle cables. I've been ordering parts using the CP215520HV (7800849-00) as a parts source reference, as from what I can see in the diagrams the basic chassis/handle layout is the same as my P216012 (year 2000 HV with 6.0 Briggs)
I have tried to buy local, called two local Snapper and Honda Dealers, but they don't return my calls. I tried to buy the Engine Local as well. I've called both at least twice, leaving messages then actually talking to a parts person that tells me he will call me back and never does. I guess they don't need the business. I ended up going mail-order for Engine and Parts.