This is what the rear splined hub looks like behind the wheel

 

This is a view of the back of the wire wheel

 

This is a side view of the rear splined hub and the knockoff

The inside back of the wheel hub seats against the 45 degree chamfer on the left
The outside face of the wheel hub seats in the groove in the knock-off

 

This is a view of the front of the wire wheel while on the splined hub.

 

The following mixture is guaranteed to disolve rust.

1 - 2 liter bottle of diet Pepsi or diet Coke 1 - 8 oz. can of powdered citric acid (available at all grocery stores in the "Canning" section).

Soak rusty parts in the mixture. When rust is gone, neutralize parts in a mixture baking soda and water. Flush in hot water and dry.