Description Reviews MINI Wiper Blade - F55/F56 Rear. These fit both the Cooper and Cooper S for any Gen 3 F-Series car 2 door or 4 door hardtop. These are a special sized OEM blade that fit into a special arm. It's an easy install for anyone that should only take about 3 minutes. You get one blade with arm that is 9.25” long. Just make sure you put the correct one on the correct side. Don't think you're going to go down to your local auto parts store and just pick up a set; they are not going to have them. While you're at it, add a rear blade and do your car all the way around. Wiper blades are recommended to be replaced yearly or soon as needed. The salt/sand of winter weather in the eastern states can do havoc to the blades, as well as, the intense sun of the western states. Be ready when you need them the most!