This is a 35/31 spline ARB. Of course we didnt notice that until the 35 spline axle on the drivers side would not go in. ARB is overnighting me the inner replacement. It is a pain but they were very apologetic. So a key note is to check your axles and carriers before you install them.
https://www.youtube.com/watch?v=8qzNmUb70ac
https://www.youtube.com/watch?v=8qzNmUb70ac