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So long as the caution to measure the arch in the beams goes with it, I have no problem with that. I still think it's less brute work to do just the spindles, myself. Someday, we will meet and can arm wrestle to settle it once and for all. (You'll win; I'm a skinny dude).
I inspect damaged vehicles every day for my job, so I'm not new to checking for damage on suspension items. The beams I got were not damaged, were identical on both sides, came off a mundane '79 donor truck that was in pretty good shape, and were so far off from my originals it could not have been from an alignment bend.
I'm as puzzled as you are, but after spending days yanking these stupid things in/out several times, I can't allow people to believe they are all the same without measuring first.