Yeah, I'm sure it's just a part that's being left off by people from previous work. I will chime in to add though, the two "side covers", 51443 and 51444, are not fitted to all vehicles out of the factory. On my 1996 HZJ80, both those parts are listed as "Not Applicable" for example. In all regions, 51444 was dropped from August 1992, while 51443 was dropped from January 1995. That front cover however, was fitted to all models in all years, so if your vehicle is missing it, a mechanic or PO left it off sometime in the past.