Sierra International 18-7145-9 Marine O-Ring - Pack of 5 Sierra O-Ring Meets or exceeds the original equipment quality Sierra part number: 18-7145-9 Interchangeable with the following: GLM 81080, Evinrude/Johnson 333572, Mallory 9-76500, Mercruiser 25-64068, Mercury 25-64068, OMC 333572 I.D.: 0.250" or 6.35mm; Width: 0.100" or 2.54mm