If you want a prerunner style bumper made for off-road, you might want to give the Duff bumper serious consideration. They are a little more expensive than they used to be, but are still loads cheaper than most anything else out there, and built for wheeling and not just looks like so many "racing" bumpers. The bumpers come unpainted, so you can just spray paint it black or have it powder coated. They've stopped making a few other bumpers so it might be a good idea to order one if you wanted, before they stop making these too.
They were out of the 91-94 skid when I called too. Looks like they still have the similar skid for the 93-97 Ranger if you felt like messing with it to have it work, but it probably is better to just make a serious skid plate from some steel sheet or something. Removing the tupperware does leave holes, but they can just be closed up with tape, as mentioned, or even better, use silicone to seal up the holes. The holes have probably allowed water and stuff into the rockers though, so there might alread be rust and junk in there that needs to be cleaned out.