+1 on Chasebays for the lines, and just leave the plug hanging or cut it off. Won't throw a code or anything, just won't kick your idle up when steering at low rpm. Only time would have a problem is if your motor is bogging at idle anyway, and you've got other problems if that is the case.
Chase Bays Power Steering Kit - Nissan 240sx w/ KA|SR|RB - Nissan 240sx - ChaseBays.com
Baller looking, and about the same as OEM. Or just get the high-pressure from them and use a pushlock for the low pressure. That's basically all it is, stock, minus some hose clamps.
edit: Just realized you were looking for the other fitting size. 14mmx1.5