I've also been able to use a 3/8 socket. That fits nicely. Just careful, those bolt heads are a little soft.
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2010 E93 M3 / MS Catless X-Pipe / AA Catback / Vorsteiner Vented Hood and Bootlid E93 Trunk / ADV1 7.1 Wheels GB / LS3 LED Lights / Harrop Supercharger
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