it will fit as long as it came from a 12 bolt.
however...in my opinion...an auburn carrier ain't worth the scrap steel it's made from.
they use cone style clutches and if it burns up...it's trash.
they are NOT rebuildable.
that's just my opinion.
like i said, if the auburn carrier and gears came from a "car" 12 bolt...they will fit in any "car" 12 bolt axle.