This 4-piece roller thrust kit is compatible with select models including X3, X3 MAX, X3 TURBO, X3 Turbo R, X3 MAX Turbo R, HD8, HD10, MAX HD8, MAX HD10, SPORT 1000R, SPORT MAX 1000R, TRAIL 1000, TRAIL 800, T HD8, T HD10, PRO HD10, 6X6 HD10, and RYKER variants equipped with 600 ACE or 900 ACE engines.It replaces part numbers 420629211 and 417127016 and is designed for use in transmission systems of vehicles from model years 2015 through 2023.