GENUINE BMW M PERFORMANCE SIDE SILL ATTACHMENTS, HIGH GLOSS BLACK, 51192455897. We offer for sale this genuine BMW G20 G21 M Performance items, new and unused. THIS LISTING IS FOR. 1 x M Performance Left Exterior Sill Attachment (High Gloss Black). 1 x M Performance Right Exterior Sill Attachment (High Gloss Black). 3' G20