rearend ? again

hate to keep asking ?'s but after i ordered it i found a rp6408 at oreillys i got it i see what barracuda is talking about the the seals made on it the repair kit in it has a replaceable seal got to looking the #on the bearing is 1559-ts so if i take it out will the rp6408 work in the houseing now? what is the 1559 # in it anybody know that # is could it be an dodge # the rp6408 should still work right ?