Zero Gs are very difficult (impossible?) to get in the UK and also very expensive. There are aftermarket forged rims I've seen which are very similar but stronger, lighter and also very expensive
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I think the track pack wasn't made available in Europe because the brake pads weren't EU compliant. I heard of someone trying to get just the rims but I don;t think they were successful.
If you want to change it so the correct rims appear in the app, go into the service menu and check 'wheel configuration' is correct.