I've sold my M6 Gran Coupe and purchased something a bit more sensible instead (X3)
I now have a set of genuine OEM BMW 408M style wheels complete with winter tyres (Pirelli Sottozero) and TPMS sensors.
Although used on an M6 I believe these are also compatible and the recommend winter wheel & tyre set for the F10 version of the M5 too.
I purchased these from my local BMW dealer in September last year and they were on the car from November 2017 to April 2018 covering a total of 2,270 mile
As you'd expect there's loads of tread left and the wheels are in very good condition. 3 of them are unmarked and 1 has a minor scuff (not kerbing). The wheels were also ceramic coated before I first used them.
I'm asking £1500 for the set, and if interested I also have a set of Macht Schnell spacers and extended wheel bolts (including security bolts) that as per the 408M wheels have been used once. One set of spacers are 10mm the other are 20mm
I'm asking £200 for the spacers & bolts and would be happy to ship these anywhere in the UK mainland for whatever it would cost me.
Both the wheel/tyre set & the spacers are up for sale on the UK eBay site
https://www.ebay.co.uk/itm/153209314990
https://www.ebay.co.uk/itm/153209333437
If you have any questions don't hesitate to ask.