Well, what kind of prop hub do you need? If you are planning on using the flywheel and the stock ignition any of the hubs made by Wackerengines or Carr Precision will work. Just tell them to tap the engine side 8mm.x 1.25. If you want to run an electronic ignition or gas/glow you might contact First Place Engines. At the present time, I'm not making prop hubs for the "masses", just don't have the time. That could change somewhere down the road though.