I have a three piece one. It has tubes to prevent the frame from compressing and bolts that fit through the sides of the stock CJ frame. The YJ one is different, I think those top holes are for tow hooks and YJ and CJ hooks have different bolt patterns if I remember right.
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10. Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com
(10 new albums added Sept 16/10)