I am not sure i understand what you mean.
For a hub extension, you pop off your hub grease cap, tap the 5mm hub extension that comes with a built in cap in its place. Now your hub is 5mm longer, the same length you lost by your spacer. Now you are back to where you started but the wheel clears the caliper and you have a full sized hub to fit the wheel on. The diameter of the hub doesnt change at all, so if you needed hub rings to fit the wheels you still do, if the hub and wheel bore are the same just bolt them on and enjoy.
For a hub extension, you pop off your hub grease cap, tap the 5mm hub extension that comes with a built in cap in its place. Now your hub is 5mm longer, the same length you lost by your spacer. Now you are back to where you started but the wheel clears the caliper and you have a full sized hub to fit the wheel on. The diameter of the hub doesnt change at all, so if you needed hub rings to fit the wheels you still do, if the hub and wheel bore are the same just bolt them on and enjoy.
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