General description These air shock struts are designed specifically for the Mercedes R-Class models W251 from 2006 to 2010. They are aftermarket replacements for the original rear air springs, providing enhanced comfort and performance. Please note that these struts are not suitable for vehicles equipped with ADS (Adaptive Damping System) as they do not include a sensor. Technical specifications Reference OE/OEM Numbers: 2513200631, A2513200631, 251 320 06 31, 2513200731, A2513200731, 251 320 07 31, 2513201331, A2513201331, 251 320 13 31, 2513201431, A2513201431, 251 320 14 31, 2513202131, A2513202131, 251 320 21 31, 2513202231, A2513202231, 251 320 22 31, 2513202331, A2513202331, 251 320 23 31 Warranty: 2 years Compatibility and accessories Compatible with Mercedes-Benz R-Class models W251, including R 280, R 350, R 500, and R 63 AMG Applicable for various engine specifications ranging from 2987 ccm to 6208 ccm Installation Professional installation is recommended Instructions are