Since you are using an Aussie locker, you will need a carrier to put it in. If your existing carrier was an open diff (versus a posi or locking diff) then it will work if you can get the welded spiders out of it. Don't assume it was an open diff because it was welded, the old clutch type posi units stop working after a while and people weld them up too.
If you have to get a replacement carrier, make sure it is an open unit.
Randy Rosetta KDØKWX TLCA #19351 69 FJ40 "Meanie" & 1970 Boss 302 Mustang