Correct, there are two types of JDM steering box. One has a solenoid/power assist that tightens up the steering at higher speeds. It uses a shorter steering shaft.
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The other is a standard steering box that you can still buy new, or at least buy a 105 box. They use a longer (standard) steering shaft, aka the same one that US models use.
@HHR137 you can have Redhead rebuild it:
redheadsteeringgears.com
Or you can rebuild it yourself and upgrade to a 105 sector shaft while you're at it:
I don't often do instructional threads but I'm gonna give it a try here. Hopefully this will make sense. I used a few other threads about rebuilding the steering box rebuild as a reference for doing this upgrade and those other threads helped a lot. The only real difference I'll have here is the addition of the 105 sector shaft.
The parts to do the upgrade can be sourced a few different places, but Cruiser Outfitters, and Wits End both stock the parts and have "kits" with the parts and seal kits. There might be others out there too, and of course dealer parts counters should be able...