Keeping the rear brakes cool is very important and has a direct affect on brake shoe life. This simple but very effective kit is easy to install. The air scoops mount to the rear axle housing with clamps, and 3” hoses connect to the backing plate with bolt on hose adapters. There is no ground clearance issue because the air scoops move up and down with the suspension. Holes will need to be drilled in the backing plate for cooling and adapter flange mounting. One size fits both 10” and 11” backing plates.