Product Description Bottom Mounting: 1x threaded hole Top Mounting: 2x threaded hole Air Spring Type: rolling lobe Top Plate Diameter: 9.00 in Bottom Piston/Plate Diameter: 7.87 in Extended length: 24.50"Compressed length: 7.75" Popular Applications Multiple Peterbilt Applications Peterbilt New Low Leaf Air Systemswithout the 3/8-16 studs Replaces Part Numbers: C81-1013 W01-358-8864 1R12-1097 FS8865 FS8864 S-36496 S-26937