Monotube Design: These 5100 series shock absorbers feature a monotube design which provides consistent fade-free performance. Off-Road Dependability: These shock absorbers combine the perfect amount of off-road dependability with smooth, on road driving and affordability. Reduces Steering Vibrations: Bilstein 5100 steering stabilizers are able to dampen minute movements in the steering and reduce steering vibrations that naturally occur. Warranty: Bilstein’s 5100 series shocks are backed by Bilstein’s limited lifetime warranty, ensuring their products are free from defects in design, materials, and workmanship. Vehicle Compatibility: One size does not fit all; These Bilstein 5100 shocks are valved and tuned to specifically fit 1987-1991 Blazer with 3-4″ front lift & front & rear leaf spring.