You need to make sure the gear ratio is the same as yours (if yours is 4x4) otherwise you will destroy your t-case if you try to use 4x4. You'll need to modify your housing to make room for the elocker motor. I don't know how you didn't find anything by searching, it's a heavily covered topic. I typed in "3rd gen 4runner elocker retofit" in google and here's what came up:
3rd gen 4runner elocker retrofit - Google Search
The 6th one down (at this time) is an entire write up so maybe try different word combos when you're searching.
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2021 Tacoma 4x4 TRD Off Road Double Cab Short Bed (my DD)
2017 4Runner 4x4 Limited (the wife’s)
