If you are talking a Gen1 00-04, the nerf bars are secured with a total of 8 bolts that are 10mm 1.25 thread, about 25mm in length. Don't forget washers and lock washers.
I have no idea if it is gen2.
2000 XE V6 4X4 5speed, AC shackles and UCAs, Bilstein 4600, K&N drop-in, intake mod, AC Idler brace, Yakima kayak rack, Shrockworks Skids, custom sliders, BFG AT/KO 32x11.5x15, custom rear bumper/swingout tire carrier, custom front tube bumper, Lokka'd front Diff.
1 Tcase ... The way it was meant to be.