82210574AC - 2 door
82210575AC - 4 door
As for the difference in rails, the enhanced rails come with an extra tub welded on them for extra protection as well as offering a quasi step. They are also a bit heavier than the standard Rubi rails.
2013 JKU Sahara, Gecko Green, loaded up
AEV 2.5XT lift, 315/70/17 Duratracs, AEV Pintler wheels, front/rear bumpers and hood, Warn 9.5cti-s, Teraflex carrier/hinge, Yukon 4.56 gears