This wheel cylinder is a hybrid, designed to take the place of both 113-611-057-B & 131-611-057. It fits Beetles from chassis #1 673 411 (just check if yours mounts with one or two bolts - this cylinder uses one). This cylinder is used on both left and right sides. These have plugs inserted at the time of manufacture to keep any foreign debris from going where it doesn't belong. This cylinder is sold as a single unit. Two will be required for a car.