Interesting discovery, nobody has defintive numbers/ratings. However a possible reason, is that there are unilimited ratings, mainly because as you touched on regarding mounting points/locations, but mainly wheel offsets and/or rim widths, which effect real world ratings. Therefore for simplicity I guess everyone just states Bar Diameter, which would only be good for comparsion on using different bars on the exact same suspension and tire rim/offest, if exact rates where important. I am starting to wonder if Sway bar Diameter has that much of a direct/precise input on handling, since there is so little empirical data advertised anyway. On TB's I feel Diameters are very noticeable in handling/ride, but they also have the same real world rating issues. Maybe just do it the hot rodder way, put the biggest one you can find on and tell all your buddies it rocks