Description Rings, steel, kit of three, 2-1/2" O.D. For piston 9N530B. This item is a suitable alternative for the following: 9N675, 1026001M1, 180898M1, 180898M91, 180898V1, 830663M91, 86551101, A577627, A-47B47, A47B47, S61589, S.61589