Features All critical components are triple-tested to ensure product reliability. All units are built with 100% new O-rings and premium-grade Viton® seals to prevent leaks. Viton does not break down at high temperatures like conventional seal material. Every pump is computer tested to measure pressure, bypass, fluid flow, valve operation, steering effort and noise for guaranteed performance. Shafts are surfaced to precise specifications to eliminate premature seal wear and extend pump life. Units are supplied with 100% tested and calibrated pressure relief valves for guaranteed performance. Year - 1984-1987. Make & Model - Buick Electra, Buick Estate Wagon, Buick LeSabre, Buick Regal, Buick Riviera, Cadillac Brougham, Cadillac Commercial Chassis, Cadillac DeVille, Cadillac Eldorado, Cadillac Seville, Chevrolet Blazer, Chevrolet C50, Chev