I believe you can use parts from a USA spec 96-02 Tacoma to install free wheeling hubs on a 90 series.
Here are some pictures from Toyodiy
Aus spec 90 series steering knuckle:

Aus spec 90 series permanent 4WD hubs:

Yank spec 96-02 Tacoma steering knuckle:

Yank spec 96-02 Tacoma free wheeling hubs:
Here are some pictures from Toyodiy
Aus spec 90 series steering knuckle:

Aus spec 90 series permanent 4WD hubs:

Yank spec 96-02 Tacoma steering knuckle:

Yank spec 96-02 Tacoma free wheeling hubs:
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