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If you have the energy, you could change the whole diff out for a factory LSD far cheaper than buying a locker, although it is hard to find a low mile, tight LSD nowadays. I'm doing the same to mine, which also has an open rear.

I'm pretty sure that the front is an R200, super common on S13's, GTRs, 180's, 240's as a rear diff so there are lockers for the front and lots of regular people have installed them.... the H233 rear is another thing. Not that it isn't available.... ( https://ruggedrocksoffroad.com/19851995-wd21-pathfinder-mechanical-locker-c-38_1321_1208.html ).... but installs are a lot less common, as are any setup and fitment issues that might be present.

If you install the 2" spacers, you could potentially have binding issues with the front CV axles while the wheels are off the ground. This side-effect seems to be influenced by the particular brand of CV axle on your vehicle. The best way to confirm whether you have binding or not is to install the spacers, then rotate the front wheels (with hubs locked) by hand and feel for any resistance or binding in the inner or outer CV joints. If there isn't, you're probably OK. If there is binding, you may damage the CV axles on any type of terrain that might cause either front wheel to max out the suspension travel. Therefore, avoid such terrain. Also, another common side-effect of 2" spacers is extreme positive camber, which may be correctable with camber bolts. After installation of the spacers, you'll need an alignment.