17's are quite popular with the Mk3, though 17" would be the max in my books. I've got a set of 15's on mine at the moment and they look great. 14"-17" seems to be the norm. I don't think there are any rolling on 18's in Australia, and for good reason.
I think 15's and 16's are perfect for the Mk3. Personally, the width matters more
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