Genuine BMW S54 Rocker Cover Stud Grommet (part 12 in diagram). Two required with any S54 Vanos rebuild. DO NOT re-use old parts – this listing is for one grommet, two required upon re-assembly after Vanos rebuild or any other rocker cover removal/re-fit. Please note that the other thirteen rocker cover grommets are made from Viton and so will not need replacement, the two front stud grommets are rubber and are recommended to be replaced.