Question about changing axles

I picked up a new pair of Moser large bolt pattern axles for my 70 Dart a while back and I am finally going to install them. The 8 3/4 rear end is the original I believe and it has a 489 center. The new axles have green bearings installed on them. Will I be able to slide them right in or is there a thrust spacer in there that I will have to remove? I know the older clutch type centers have the thrust spacer but wasn't sure about the 489.