Not mine but if anyone is interested appears to be a set of half leather sports seats on ebay!
http://www.ebay.co.uk/itm/BMW-Z4-E85-OR-E86-M-SPORT-2X-HALF-LEATHER-CLOTH-MANUAL-SEATS-/180962421452?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item2a22336acc
