When replacing Navigator/Pool Vac Ultra parts, consider purchasing a pool cleaner tune-up kit. If one set of parts requires replacement, it's probably a good time to replace all of these parts. This kit includes a set of 4 shoes, a set of 2 wings, a set of 2 flaps (front and rear) and a screwdriver and brush to install the parts. When you purchase this kit, check to make sure you purchase the kit with the correct shoes. Shoes for concrete or gunite pools are different than shoes for fiberglass of vinyl pools.