P/N 3472380 REF: RING-PISTON TOP 140M, 160M, 2290, 2390, 2391, 2491, 2590, 330D, 330D FM, 330D L, 330D LN, 330D MH, 336D, 336D L, 336D LN, 340D L, 511, 521, 521B, 522, 522B, 532, 541, 541 2, 551, 552, 552 2, 586C, 627G, 637D, 637E