Want to lose some weight off your R53 MINI without removing the interior? Then the R56 rear trailing arm swap is for you! Replace the heavy stock steel rear trailing arm on your R53 with a lightweight factory aluminum trailing arm from the R56. Saves about 8 pounds per side. Our kit comes with everything you need to do the swap, including a set of good used R56 rear control arms, new heavy duty wheel bearings and hubs, all bolts and hardware needed and the correct swaybar end links.