SSR-313-54 Suspension Air Helper Spring Kit Replacement for Ram ProMaster 1500/2

SSR-313-54 SUSPENSION AIR HELPER SPRING KIT REPLACEMENT FOR RAM PROMASTER 1500/2500/3500 2003-2021 REAR BUMP ENHANCEMENT * Fitment:for Ram ProMaster 1500/2500/3500 2003-2021. * Replaces part number:SSR-313-54. * Material:Yellow urethane is -54 density--traps a smaller amount of air in the air spaces creating a stronger air spring suitable for medium and heavy duty applications. * One-piece units attached on one side used as a replacement/upgrade to factory bump stops,and attached on top and bottom allows up to 50 percent expansion of original body height. * 2-piece units attached on top and bottom using separate male and female pieces allows unlimited travel.