ROLLING LOBE AIR SPRING ASSEMBLY - Heavy duty rolling lobe air spring assembly designed for tractor air suspension systems providing stable ride height and vibration reduction. PLASTIC BASE CONSTRUCTION - Durable lightweight plastic base engineered for corrosion resistance and long service life in commercial truck applications. LOAD CAPACITY - Rated at 6,280 lbs at 100 PSI and 5,020 lbs at 80 PSI for dependable load support and suspension performance. DIMENSIONS AND TRAVEL - Compressed height 3.9 inches, extended height 11 inches, maximum diameter 9.12 inches. Parallel mounting alignment. MOUNTING CONFIGURATION - Bottom plate: 1 bolt hole, 8.82 inch diameter. Top plate: 9.00 inch diameter with 2.24 inch center-to-center mounting configuration