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The "BTF Stand-Alone Coil Mounting Kit" makes a tough job easy. This kit comes with everything but the coils. You will receive enough parts to do one axle. Our kit was designed to work with axle tube diameters up to 3 1/2". The kit captures the upper and lower mounting points so you will never have a spring pop out. The upper mount was designed to be used on the inside or outside of the frame rail. The installed width of the upper mounts set the width of the lowers. All of the plate parts in this kit are laser cut from 3/16" high-strength steel. The kits includes grade 8 hardware along with a spacer sleeve to prevent over-tightening (and warpage) of the capture plate and another 2 1/2" sleeve of the same height to keep the spring centered on the perch. These coil mounts work with rear TJ coil springs or 2 1/2" coil-over springs.