POLARIS REAR HYDRAULIC SLIDE SHOCK ABSORBER. GAS SHOCKS FOR SNOWMOBILE SUSPENSION - ADJUSTABLE TO MEET TRACK OR SNOW CONDITIONS. CONSISTENT OPERATION IN ALL WEATHER CONDITIONS. EYE LENGTH: EYE DIAMETER: OPEN: 15" CLOSED: 9-1/2" TOP ID: 5/8" BOTTOM ID: 3/8" UPPER SPRING RETAINER: NONE COIL SPRING AVAILABLE: NONE