Febi 12399 Differential Mount

Mercedes-Benz Differential Mount for Rear Rearward Applications

Febi 12399 is a rubber differential mount built for rear rearward applications on select Mercedes-Benz models. With a 15.0 mm inner diameter, 66.0 mm outer diameter, and 29.0 mm width, it is sized for direct replacement use where the original mount has worn, cracked, or softened.

The febi product line focuses on OE-style replacement parts for European vehicles, and this differential mount follows that approach with application-specific dimensions and rubber construction. Part number 12399 is listed for Mercedes-Benz SLK, CLK, C-Class, and E-Class rear differential mounting locations.

• Rubber differential mount for driveline and axle service
• Inner diameter: 15.0 mm
• Outer diameter: 66.0 mm
• Width: 29.0 mm
• Rear rearward mounting position
• Direct-fit replacement reference for Mercedes-Benz differential mount service

Detailed Product Information

This Febi differential mount is used to secure and isolate the rear differential assembly, helping maintain driveline alignment and reduce unwanted movement at the mounting point. The rubber construction is selected for vibration isolation, while the listed dimensions help match the original Mercedes-Benz fitment requirements. Part number 12399 is a practical replacement choice for Mercedes-Benz SLK250, SLK350, SLK55 AMG, CLK500, CLK55 AMG, C240, C320, CLK320, C32 AMG, E320, C230, E430, E55 AMG, E300, and E420 applications listed below.

This part cross-references Mercedes-Benz 129 351 21 42 for the same application.

What This Part Helps Address

• Excess movement at the rear differential mount
• Clunking or driveline noise from a worn mount
• Vibration transfer caused by deteriorated rubber
• Loose or unstable differential support
• Restoration of proper rear differential positioning

Installation Notes and Fitment

Compatible With Mercedes-Benz rear rearward differential mounting applications. Verify the listed dimensions and mounting position before installation. Fits 2012-2015 Mercedes-Benz SLK250, rear rearward; Fits 2012-2015 Mercedes-Benz SLK350, rear rearward; Fits 2012-2015 Mercedes-Benz SLK55 AMG, rear rearward; Fits 2006 Mercedes-Benz CLK500, rear rearward; Fits 2006 Mercedes-Benz CLK55 AMG, rear rearward; Fits 2002-2005 Mercedes-Benz C240, rear rearward; Fits 2002-2005 Mercedes-Benz C320, rear rearward; Fits 2003-2005 Mercedes-Benz CLK320, rear rearward; Fits 2002-2004 Mercedes-Benz C32 AMG, rear rearward; Fits 1999-2003 Mercedes-Benz E320, rear rearward; Fits 2002 Mercedes-Benz C230, rear rearward; Fits 1998-2002 Mercedes-Benz E430, rear rearward; Fits 1999-2002 Mercedes-Benz E55 AMG, rear rearward; Fits 1996-1997 Mercedes-Benz E300, rear rearward; Fits 1997 Mercedes-Benz E420, rear rearward.

Quality Assurance

Febi is an established aftermarket brand for European vehicle replacement parts, and this differential mount is built to match the specified application dimensions for Mercedes-Benz driveline service.