The AlumaStar 2.0, AlumaStar PRO, Magnum 2.0, Magnum PRO, V-Series, WELDStar RT, Magnum III RT, Vektor RT, Vitesse RT, Classic RT, Woodward RT, and the 15“ S71 have lug holes drilled to accept a 5/8” drive stud. The lug hole opening is drilled to .703”. The Draglite, ProStar, and Rodlite have a lug hole opening of .687“ which will not allow the use of a 5/8” stud without altering the size of the lug holes. This will affect the warranty. None of the 17“ or 18” RT-S series products will accept a 5/8” drive stud.