I have an 02 which has a valve cover breather for each side, but it looks like it is just the valve cover breather tube. I wouldn't bother trying to find a replacement, just go to your local auto parts store and get a piece of rubber hose that can splice the split. It would be a dealer only item. Several of my plastic hoses have cracked when working on the KJ and I have just fixed all of them with rubber hose. Good luck.
1992 YJ Sahara- 4.5" RE XD, 1" BL, 1" MML, 35" BFG MT, 8.8 w/Aussie, D30 w/Ten Factory shafts/ Aussie, 4:10 gears, Soild Diff Covers, SYE, CV Drive shaft, OBA, Flowmaster Super 44,, Custom head pipe, Super Chip, Boared out TB, Rock It Intake , Goferit Tie Rod Flip, 99+ intake manifold/Steering pump, custom front/rear bumpers,Hand Throttle, Hurst Shifter, Smitty Built sliders , 6" TJ flairs, Kilby belly up skid, Quadratech 9K winch, ZJ PS cooler. 01 XJ Sport-2" lift, 31x10.50 MT/ 02 Liberty 2" Lift