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I run 20mm hubcentrics on the rear of my s2 and there ok. Not done a stud conversion I'm just using the longer bolts that came with the kit and there ok on my car mate
I run 15mm Eibach hubcentric spacers on my ST to bring the RS wheels out to the correct offset. They've been on for roughly 10k miles and they've been fine.
I wouldn't use Leepu 6" ones or anyy from China etc though!