i'd hurass Ben @ hodges (I believe his name is hondaslayer on the forum) and have him get you a ring and pinion set. Race comps set is kinda $$$ and all you really need is the Ring and Pinion for the rear dif since your tranny is already 4.44 ready.
At the end of the day if you still can't find a r160 4.44 rear dif, PM me. I'll either get you in contact with someone who can get you one or I will give you one of my spares (I have 3 of them now
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And if you happen to come across a r180 4.44 rear dif, GRAB IT AT ALL COSTS.