Quicksilver 87400A2 Trim Cylinder O-Ring Kit for MerCruiser R/MR/Alpha/BravoQuicksilver 87400A2 Trim Cylinder O-Ring Kit offers a reliable solution for maintaining your MerCruiser sterndrive. Designed specifically for select R, MR, Alpha One, Gen II, and Bravo models, it ensures a proper seal and consistent performance.Features11-piece o-ring replacement kitCompatible with s/n 2A480243 & belowEasy installation with standard shop toolsSee owners manual for fitmentFits:R, MR, Alpha One, Gen II & Bravo (s/n 2A480243 & below)R/MR/Alpha One (1983 – 1990) s/n 6225577 – 0D469858R/MR/Alpha One (1983 – 1990) s/n 6225577 – 0D469858R/MR/Alpha One (1983 – 1990) s/n6225577 – 0D469858Alpha One SS (1986 – 1989) s/n 0A545004 and upAlpha One SS (1986 – 1989) s/n 0A545004 and upAlpha One SS (1986 – 1989) s/n 0A545004 and upAlpha One Gen II (1991 – 2015) s/n 0D469859 – 2A480243Bravo (1988 – 2015) s/n 0B664190 – 2A480243Bravo SeaCore (2007 – 2015) s/n 0W900000 – 2A480243Blackhawk (1994 – 1995) s/n 0F186717 and up