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Just go to the dealer and get a new one price matched to online prices.
They gave me 0 hassle at the dealer and I got a new diff with c6 style shafts for under $1700 out the door in 2 days.
I didn't take it all apart, but you can see both the shafts are 2 piece. I was told by people in the know it uses the new clutch pack as well. I don't know if it uses the new pinion support but if you aren't drag racing you really are cracking the clutch plate springs before anything else.