I would have thought they are polished alloy rather than stainless steel. In which case they can be repaired quite easily, there is a place in Welwyn Garden City in Herts that does it.
it might be the case that it not possible to repair them as is,ultralite wheels also have a stainless steel coating applied to the lip of the wheel,this is because its longer lasting than polished and laquered alloy or chrome
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