Replacement Part Numbers: A2512800900, 2512800900, A2512800700, A2512801200, A2512801800, A2512802100, A2512802700, A2512802900, A2512803500Wide Vehicle Compatibility: Fits for Mercedes-Benz M-Class W164, for Mercedes-Benz GL-Class X164, for Mercedes-Benz R-Class W251/V251 equipped with 4-MATIC all-wheel drive. Compatible with M113, M272, M273, M642 engines (approx. 2005-2012). Crucial Fitment Note: This transfer case is for 4-MATIC models ONLY. Please verify your original transfer case part number before ordering, as internal variations exist and may not be interchangeable.Plug-and-Play Installation: Direct bolt-on replacement with factory mounting points and electrical connector. Installation is straightforward Quality Assured: Built with durable materials and rigorously tested to ensure reliable, long-lasting performance. If you encounter any issues during shopping or have questions about compatibility, please contact us promptly through Amazon Buyer-Seller Messaging.