1、Applicable Model: The gimbal housing anode is for replacement for MerCruiser R MR Alpha One Gen II Bravo Series X XR XZ Drives. Please confirm whether it is consistent with the product you want before buying to avoid unnecessary return. 2、OE Number: The part number for reference is 821631Q1. Please confirm whether it is consistent with the OE you need to avoid wrong buying and other problems. 3、Premium Material: The boat gimbal housing anode is made of high strength and sturdy material, resistant to wear, tear and rust, ensuring long lasting use. 4、Protective Function: Check anode plate regularly for optimal guard to your boat, replace when oxidation or pitting is discovered to help lower maintenance costs. 5、Easy Installation: The anode features quick installation for fast replacement on boat drives, time and effort saving, no special tools or complicated steps required.