Firestone Coil Rite Air Spring Bag Model 4121 CR 4121 COIL-RITE
[F039-4121]

Coil-Rite™ air helper springs mount inside an existing open coil spring suspension. These air springs provide adjustable spring rates far superior to the standard coil spring. The durable polyurethane air springs will support 500-1,000 lbs per set*.
Coil-Rite air helper springs are made of durable polyurethane to withstand the rigors of coil-sprung suspensions.

Fits:
90-97 Defender 90
90-04 Discovery (with rear coil springs)
90-96 Range Rover