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: 00790832511989 Brand Name: Bilstein Internal Design: Monotube Upper Mount Type: Stem Series: AK Series Adjustable Damping: Non-Adjustable Boot Included: Blue Straight Piston Type: Linear Rebound @0.26m/s: 905 Collapsed Length (IN): 12.64 Compression @0.26m/s: 330 Lower Mount Type: Eye 12mm Body Design: Stock Mount Smooth Body Finish: Yellow Paint Collapsed Length (MM): 321.0 Extended Length (MM): 512.0 Body Diameter (ID): 46mm Valving Identifier: 152/103 Spring Seat Included: No Body Material: Steel Extended Length (IN): 20.16 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 2.9500 x 2.9500 inches Weight: 4.3000 lb PDF: USA SDS_Shock_Air Spring_V2_EN Generic_instructions_02