You can put lock-stops on the car.
However, my preferred method is to use an MOT garage that understands Volvos (ie a Volvo MD or a Volvo Specialist) as they are a lot more 'flexible' when it comes to issues like this. I've had 18 inch wheels on my car that have rubbed (also Volvo standard), and its passed its MOT every time with these wheels.
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s60 d5 - rica'd, heico prepped, bbk, twin exhaust
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