CS144 is correct
http://www.toyota-4runner.org/3rd-gen-t4rs/135318-docs-cs144-alternator-upgrade.html
should be an easy swap, you can also order and adapter for $12 and it makes the whole thing plug and play, make sure you get the alt with the grooved pulley instead of the other one!
the draw backs of this, or so i've heard is that they might be a bit more prone to failure during water crossings, so there has been various discussions on other alternatives and the validity of that statement in general.
i've been considering doing this upgrade and getting really close to the point where i am forced to do this because of all of the stuff I'm powering...
i'd really like to go with cs144, but have been awol from here for a few years and would like to hear from people who are using these, today, what your impressions are and if you've had any failures....i'd much rather go with the $150 cs144 than paying $500 or more for one of the custom jobs...