Rear Driver or Passenger Side Nitro Shock Absorber for 4.0" Lifted Vehicles (ZON7950) by Zone Offroad. Quantity: 1 per Pack. The Zone Nitro Series shocks absorber offers the ultimate in control and performance. The full displaced valving offers a better valving range on both the compression and extension travel. This vehicle specific valving is pressurized with a low pressure nitrogen gas. This gas charge ensures split second response and reduced aeration. Combine these features with the special Fluon banded piston and this shock is built to perform.