GENUINE BMW M PERFORMANCE SIDE SILL ATTACHMENTS, CARBON FIBRE, 51192464417. We offer for sale these genuine BMW M Performance items, new and unused in original packaging. THIS LISTING IS FOR. 1 x M Performance Left Exterior Sill Attachment (Carbon Fibre). 1 x M Performance Right Exterior Sill Attachment (Carbon Fibre). 8' G14 Convertible (10/2017