I see no one answered. Check here:
http://www.northerntool.com/shop/tools/ ... _200442392 and it indicates that the inaner and outer bearings are different. For less than $40, it might be simpler to have this whole hub ready to go as a spare. Or look around here for people who bought a NT trailer and never install the kit axle. There is/was one fellow in Texas willing to give away- pay forward - the axle, hubs, and wheels.
Want to save ~$25 dollars at the cost of more work replacing it,
http://www.northerntool.com/shop/tools/ ... _200468657. That suggests 1 3/8in. L68149/L68111 inner bearing and 1 1/16in. L44649/L44610 outer bearing.
I'd be curious what you end up doing as I will face same issue.