Bilstein AK Series shock absorbers are designed for motorsports applications that require the use of the OE mounting components. Each shock absorber features a monotube design with steel spring valve discs for consistent, fade free performance and superior durability. AK Series shock absorbers are ideal for racers who demand reliable performance that also meets their sanctioning body's mounting requirements. PartNumber : bilAK1199 Description : AK Series - Suspension Strut Assembly Series : AK Series Title : Bilstein Shock Absorbers Boot Included : Blue Straight Collapsed Length (IN) : 15.98 Collapsed Length (MM) : 406 Compression @0.26m/s : 520 Extended Length (IN) : 21.42 Extended Length (MM) : 544 Finish : Yellow Paint Internal Design : Monotube Lower Mount Type : Bracket Rebound @0.26m/s : 1165 Upper Mount Type : Stem Valving Identifier : 224/122 Adjustable Damping : Non-Adjustable Body Design : Stock Mount Smooth Body Body Diameter (ID) : 46mm Body Material : Steel Compression @0.52m/s : 690 Piston Type : Linear Rebound @0.52m/s : 1435 California Proposition 65 : WARNING: Cancer & Reproductive Harm - www.P65Warnings.ca.gov Suspension::Shocks and Struts