The modded connector with the wires joined is done when converting to manual to bypass the inhibitor, easiest way to do the wiring if you can find one is the de loom from an a31 or c33.
Cefiro did come with hicas on some models.
/\ NA box definitely has a smaller different drive, NA manual R33 etc onwards have the electronic drive for the small box.
S14 & 15 SR 5 speed should work but will need a different gear.