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- GEAR SET LOWER ALPHA
GEAR SET LOWER ALPHA
Product Code: SIE18-2206-1
Sierra 18-2206 Lower Unit Gear Set for ALL MERCRUISER ALPHA DRIVES.18-2206 Alpha Lower Gear Set - Pre-GEN II Replaces 43-17064A3 + 43-42934, 43-170964A2 Gear Set. Fits Units with no preload pin in the top of driveshaft. NOTE: When installing new style 1