Description Reviews MINI Cooper Rocker Cap. Brand new plastic rock cap and tip to fix your rocker arms. New Rocker arms are 60 dollars or more and all you need is that small plastic cap! Here you go, this is your only option that will fit the W11 Cooper s & W10 Cooper motors. You will take the cap off this part and install it on your arm. The whole center section will not get changed out. 1 Review 5 Auto parts Posted by Conrad lau on 26th Mar 2021 I Called and was very happy with the information received. Big help after looking for this part for over a year.