Ultima | Heavy Duty Gas Shock Absorber 333/529 EB1/EB1 | Various Applications | 400040BUltima Heavy Duty Gas Shock Absorber (Single) 400 Series The Ultima 400040B is a high performance, Heavy Duty Gas Shock Absorber from the Ultima 400 Series. Designed primarily for the rear axle of various custom or universal applications, this shock is specified by its key dimensions and mounting type (333 529 EB1 EB1). It provides reliable, consistent damping and is ideal for vehicles requiring enhanced control and stability, particularly under heavy