Aluminum. Fits: Honda BF75-BF90 HP (1997-98). Mercury Inline 3, 4, and 6 cylinder, V6. Mercruiser R/MR/Alpha One, Sterndrive & Transom Assembly (1983-90) & prior drives, Alpha One, Gen II (1991 & up). Replaces: Honda 41107-ZW1-003ZA, Mercury/Mercruiser 31640, 31640A1, 31640Q4.
