Getting ready to make an order with Barnes for a front and rear bumper. I am already running the belly skid, and couldn't be happier with it. I would also like to use their gas tank skid, but I am confused on the need for a 1" body lift for proper installation. It seems that the earlier TJ models do not require the BL. I am wondering if anyone can tell me what changed between the earlier and later models that makes the difference. The TJ I am working with is a 97 4.0L. Any information would be appreciated.