i have a 2.5 inch lift on my 89 bronco, it used drop brackets for the radius arms but now im thinking about buying extended radius arms, do they use factory mounts or do you have to move the mounts back on the frame? and i noticet that only 4" and 6" lift kits offer extended arms. will they not work with 2.5" lift? and im also thinking about buying a 4" lift, if i buy the same brand lift (rough country) can i use excisting holes for the drop brackets form my old lift kit?