AP02 transfer case designed for use with W221 W204 W212 W218 4-Matic 7G-Tronic 722.96 transmission systems.OEM number A2212740810、221 981 00 18、2219810018、A 221 981 00 18、A2219810018.This component supports power distribution between axles and integrates with all-wheel drive configurations.Built to match specifications, it compatibility with designated vehicle models.Before installation, it is necessary to add transmission oil to the transfer case. Failure to add transmission oil before installation may damage the product and cause premature failure. We strongly recommend that you add transmission oil according to the manufacturer's instructions before installation.The unit is engineered for durability under normal operating conditions and is intended for professional installation. Disclaimer: This is a compatible third-party part. Brand/model citations are solely for compatibility guidance.