VAC makes high quality spacers & extended lug kits:
I would get extended lugs with any spacer to be on the safe side (or a stud kit).
I have F/R spacers from VAC on my car. Beautifully machined and not expensive.
2011 BMW E92 335i, 6MT, Le Mans blue - Quaife LSD, JRZ RS Pro, JRZ camber plates, Eibach ERS, full M3 susp, custom toe arms, Powergrid end-links, SS brake lines, brake ducting, Michelin PSS, UUC SSK, ETS FMIC, ER CP, Perf. Exhaust, VAC RSIK, Sparcos; work by VAC Motorsports in Philadelphia