Thanks for posting!
Yes, the
81-228 Nylon Wheel can be replaced with the 81-241 Stainless Steel Wheel.
Now, as for the axles, it mostly depends on your application and what length of axle you'll need. In terms of fit, the
81-304 Axle will slip in and out pretty easily, whereas the
81-203,
81-303 and
81-307 are a bit difficult to move and are made to lock into the roller.
