No, the JDM LSD centre will not fit. I wish it would!
I can't imagine a Hilux diff breaking very easily with a N/A engine, but I guess it depends how much power you're producing. Is your car N/A or force fed?
I guess ppl want to upgrade 'em so it stops better, but the upside of getting the JDM diff housing and LSD is that disc brakes come as part of the deal.