Quick Overview 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. Attributes: GTIN: 00790832511996 Brand Name: Bilstein Valving Identifier: 224/122 Series: AK Series Boot Included: Blue Straight Compression @0.26m/s: 520 Lower Mount Type: Bracket Body Material: Steel Rebound @0.26m/s: 1165 Adjustable Damping: Non-Adjustable Extended Length (IN): 21.42 Collapsed Length (MM): 406.0 Spring Seat Included: No Upper Mount Type: Stem Body Design: Stock Mount Smooth Body Piston Type: Linear Finish: Yellow Paint Internal Design: Monotube Collapsed Length (IN): 15.98 Extended Length (MM): 544.0 Body Diameter (ID): 46mm Extended Information: Country of Origin: United States Emissions : Released Life Cycle Status: Available To Order Packing Information: Quantity of Each: 1.0 Package UOM: EA Dimension: 26.8000 x 3.5500 x 3.5500 inches Weight: 8.0900 lb PDF: USA SDS_Shock_Air Spring_V2_EN Generic_instructions_02