170C wrote:.... George's suggestion for a spare might work just fine. I don't know if it would work to fly you home or not, but likely would. ...

Yeah..it would work just fine. I had this exact Northern Tool wheel assy in my hangar intending to use it and it's companions to build a rolling worktable.
I arrived one night late at my place and landed with a flat tailwheel. It's really difficult for one person to move a 170 with a flat tailwheel into the hangar even for a short distance.
I remembered the wheel. it's axle hub is exactly the correct width for the Scott tailwheel fork, and the tire and tube (although chineese) are actually the same size as the official tailwheel tire/tube...2.50/2.80-4. (I suppose that it's cheaper to buy this Northern Tool wheel assy just for the TUBE...

....but, I digress...) Anyway, I jacked the plane, removed the axle, installed this N.T. wheel. Took maybe 4 minutes....and pushed the plane into the hangar.
If a bushing was used to adapt the 5/8" NT hub to the Scott 1/2" axle-bolt was used (bluEldr recommends common copper tubing) you could fly all the way across the country on it, until you got home to make permanent repairs. (Or you could just steal the tire/tube off it, and install on the Scott wheel, just to get home.)
Anyway...the price is right if you need an exigency plan to move your airplane and don't have a dolly or other method. For the short distance involved I simply put it on the 1/2" Scott axle and moved the airplane. A bushing would only be necessary for long-term use.