problem with output shafts

So im a noob, i bought a nismo 2way clsd from some bastard who said it would fit my s14 open diff without problems, it did fit my diff but the output shafts won’t work with this new unit. anyone know what output shafts can work with this unit? from what i sourced out it maybe a r32 gtr nismo 2way clsd, LOM59 is stamped on the casing as far as splines go i don’t know how many there are but my stock s14 output shafts fit in but not all the way, there’s about a 1/4 if an inch that sticks out on either side of the output shafts and i don’t really want to swap out the half shafts from 2 6bolt pattern to a five or etc…