Im gonna offer up an opinion here based on my 20 years as a welder/inspector on this set of spacers.
First, it appears the 3 grade 8 bolts were welded in the top by two tack welds per bolt. Im going to ask that my installer to add some weld to that...like all the way around. Welding changed the hardness of that grade 8 bolt anyhow. Id also add some short welds on the outside of the tube where it meets the coil mount, and maybe on the topside of that plate too. It looks like three pieces of steel were joined with one weld, ok for a quick fab job, and a show truck, but not a rockcrawler where there's lots of flex. Ok I've voided the warranty,right? Who cares! Its my truck, and really, what kind of warranty does one expect on an aftermarket part?