I just put the OME kit on my BJ73 and it leans crazy... the leafs for the DS of the truck are sprung more than the PS, ARB told me it was to account for the weight of the driver and the spare. So if installed correctly the OME kit should be taller on the right side ( DS of a RHD ) by about an inch. This is what ARB said...
I think that is retarded. I just spent good money on new suspension and to have it lean ( noticably ) really pi**es me off. I called them and had them reassure me I installed them on the correct sides, but to give it a month or so to break in. I lasted a week and said screw it, put the truck back up and swapped them from side to side. Same thing, just the opposite. So then I swapped them back, AGAIN.
I called ARB last week and said I was unhappy, and I wanted them to send me another spring. They agreed to send me another DS spring, saying that sometimes the springs just work out and sometimes they don't. Hmmmmm...
Whatever the reason behind the 2 different rear springs is I don't know. What I do know is that I would need a 44" spare and a couple girls on my lap for my truck to level out...
...but they did agree to send me another spring, same from side to side... that will make me VERY happy ( once the removal and install are completed AGAIN, of course... )