1、OE Number: The replacement part number for GLM is 21900, for OMC is 983937, and there are other reference part numbers are 18‑2100, 30 60794A4, 3853807‑0. 2、Strong Compatibility: Specially designed replacement for OMC Cobra, replacement for Mercruiser Bravo and Alpha Gen 1 and 2. Fits for MC‑1 R MR, for Penta. 3、High Strength Material: Constructed with reliable alloy steel, the gimbal bearing can withstand daily wear and tear, ensuring lasting use and durability. 4、Boost Efficiency: With the high grade gimbal bearing, boat working's efficiency is improved greatly. Drive with ease while enjoying the improved efficiency of your boat's performance. 5、Simple Installation: Installing the boat gimbal bearing is a convenient task that saves time and doesn't require a bounty of tools or complex procedures.