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Rear Tank Support Crossmember replace the crossmember located forward of the rear axle that supports the rear end of the gas tank. Function:Pre-welded on the cross tube are the left side inside mount plate, the right side upper shock mount. Vehicle Fitment:Fit for 1999-2006 Chevy Silverado/GMC Sierra 2500/HD. Two outer end plates and right side inside mount plate are sent loose for ease of installation.Set the replacement cross member in place, weld it solid, and reinstall your fuel tank and new shocks. Easy install:No need to remove the truck bed, just remove the fuel tank, the old shock and cut away the remaining crossmember.