Mercury – Mercruiser 43-16138T01 Gear-PinionGenuine OEM Mercury-Mercruiser part.Special Order Mercury Marine Information:Additional Handling Time: Item transfers from an alternate warehouse requires an additional 13 business days to ship.Non Returnable: This item is ordered specifically for your application and cannot be returned or canceled once processed.Verify Fitment Before Ordering: Please confirm compatibility with your engine model.