You would obviously need the ring & pinion gears, some shims & bearings & o-rings the correct size, and the output shafts/cups but I cant see any other specific parts missing really. You can probably look up the required other parts, though you can buy complete 6 spider diffs for about ~$35-30 each:
http://cgi.ebay.com/NEW-OFNA-HYPER-7...item48406be01c
http://cgi.ebay.com/OFNA-Hyper-7-TQ-...item1c1be4cf4d
etc etc, just search ebay for 'hyper diff'...