Your stock tires are 215mm wide, and are approximate height of 66.5cm (a little less if you've got 16"s, a little more if you've got 17"s). Ideally, you'd want to find a tire with that exact width and height, as there'd be no issues with fit - I just can't find them in a quick search. However, 225/35R20s are common enough, and are just 10mm wider and about 2cm taller, which should be a fairly minimal difference (in theory).
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