Found that on mine when i took that goofy lookin fender flare extension off my jeep. Not sure what its for, its like shrink wrapped with plastic across it. I put diamond plate rocker guards on anyhow to cover it up. It is rather goofy lookin exposed though.
01 TJ. Dana 30/44 4:88's, 4.0 5 speed, 38.5x15 Boggers on 15x10 Streetlocks, CAI, B&M short throw, Neoprene Covers, 4" RC, 3" BL, too much to list and building. >..<