The perchs on the rear axle that holds the rubber bumpstop have what can only be described as a design flaw in that they hold water with no way for it to drain. Under these conditions it’s not surprising that the center post rusted away from the center of one. I welded on a nut and bolt of similar diameter in place of the missing post and drilled small drain holes at the bottom of both perches. The rubber bumpstops slide over the top of the posts so the repair will not be evident and will work as well or better than original.