I think they do know the difference. They sell two different kits. He has welded the axle brackets at the correct dimension for his truck. They sent the wrong frame brackets but the correct instructions. It's just a matter of getting the correct frame brackets instead of some kind if work around fix. That's what I see. I wish he would confirm if he agrees or doesn't. He may have done some other work that is undoable?

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn