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 : bilAK1052 Description : AK Series - Shock Absorber Series : AK Series Title : Bilstein Shock Absorbers Boot Included : Blue Straight Collapsed Length (IN) : 11.28 Collapsed Length (MM) : 286.5 Compression @0.26m/s : 500 Extended Length (IN) : 17.2 Extended Length (MM) : 437 Finish : Yellow Paint Internal Design : Monotube Lower Mount Type : Cantilever Rebound @0.26m/s : 1445 Upper Mount Type : Bar Pin Valving Identifier : 324/112 Adjustable Damping : Non-Adjustable Body Design : Stock Mount Smooth Body Body Diameter (ID) : 46mm Body Material : Steel Compression @0.52m/s : 905 Piston Type : Linear Rebound @0.52m/s : 2710 California Proposition 65 : WARNING: Cancer & Reproductive Harm - www.P65Warnings.ca.gov Suspension::Shocks and Struts