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Lower Unit Gear Set for MR/Alpha/Gen II, 18-2206-1 Sierra
Replacement for Mercury Marine OEM:. 43-17064A2. 43-17064A3. 43-42934. Fits Mecruiser 1996 & older with s. n. F679999 & lower. For all Mr/Alpha/Gen II (except Gen II 2. 00-2. 40 ratios).