Sold as a pair, these washers allow R53 owners to fit Gen 1 coilovers onto a Gen 2 Mini. Mini R53 to R56 Rear Trailing Arm Coilovers Conical Washers. Supplied as a pair (2 washers.). If you're looking to upgrade your Gen 1 trailing arms to the lighter Gen 2 trailing arms, you will also need these washers.