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The specs for the builder springs are 4" diam and 5" tall, plus spacers.Those are 4"x2"? If so, may make more sense to install what I did in your stock location and then add more to the BDS axle stack. They'd fit the stock location are 4" diameter and about 5.5" tall. Been looking getting some of the leaf spring ones for the trailer after looking into them more..
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