A couple of useful Wheel and Tyre comparison tools are these but remember changing the overall tyre rolling diameter will also subtlety alter the steering geometry as will rim width and offset.
https://tire-calc.com/comparison/215-50-r17-and-215-55-r17/...
Wasn't there an official compliance statement published by MG when they got the bars certified at 35kg? Maybe if you tracked that down and emailed it to Thule's Customer Services or Technical Support you'd get an answer. Good luck and when you get the compatible product number be sure to post it...
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