ApplicationCompatible for Mercedes-Benz S350 2012 compatible for Mercedes-Benz S400 2010-2012 compatible for Mercedes-Benz S550 2007-2012 compatible for Mercedes-Benz S600 2007-2012 compatible for Mercedes-Benz S63 AMG 2008-2012 compatible for Mercedes-Benz S65 AMG 2007-2012 (Models without 4 Matic or Active Body Control)Specification- Condition: brand new. - Placement on Vehicle: Front left/ right. - Quantity: 2 piece (for front left and right side). - Warranty: one year warranty for any manufacture defect.OEMandPart Number221 320 49 13, 221 320 93 13, 220 320 5113 , A221320511360 , A221320511380 , A221320511388 , A2213207313 , A221320731360 , A221320731380 , A221320731388 , A2213209313 , A221320931360 , A221320931380 , A221320931388 , A2213209713 , A221320971360 , A221320971380 , A221320971388Note- These air suspension spring are aftermarket ones. They will replace the originalair shock. Please double confim the compatibility as well as the OEM number before purchasing. - Instruction is not included. Professional installation is recommended. - Contact us please for whatever we can help.