Firestone Coil Rite Air Spring Bag Model 4101
[F039-4101]

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:
75-08 E-150
75-91 E-100, E-150
75-08 E-250
75-08 E-350
96-08 E-450
69-96 F-250 Under 8500 GVWR (4x2 only)
84-08 F-250 Over 8500 GVWR (4x2 only)
06-08 F-350 (4x2)
70-04 F-350 (4x2 only)
07-08 E-250
75-08 E-350
96-08 E-450
99-04 F-350 (4x2 only)
75-07 E-350
96-07 E-450
86-96 E33 (with front coil springs)