Front end differential

Try www.car-parts.com it is a national salvage yard search, I get quite a few parts from back east.

You need to call an auto parts recycler (junkyard) and get a price on the (guaranteed) part you need. Then get to a Nissan specialist and ask what it costs to install it. I don't have a listing for labor on this repair. Here's a directory link for you: http://repairpal.com/nissan-repair-in-san-diego-california