Arm kits are composed according to the car model, including upper arms, lower arms, anti-roll bars, tie rods, ball joints, and pivots. Front and rear arm sets are available for a wide range of cars from various brands such as TRW, Lemforder, Master Sport Germany, Delphi, and Budget. Arm kits can be sourced for specific car brands not displayed on the website, as well as individual components like ball joints, tie rods, control arms, or control arm bushings.