Differential jdm s13 and usdm s14 into a s13

[MasterOFDrift]

well here is the deal I have a s14 with most likely a s14 cross member. The owner prior to myself did the 5 lug conversion. Well today I took out my differntial abs s14 vlsd. well I also have a s13 jdm differential with a nismo lsd in it. So here is my dilemma the s14 has 2 carrier bolts while the s13 has 4. my cross member only has two holes for the carrier bolts. The covers of the differentials do not look like they will be interchangable. Any ideas to what I should do? Or any ideas what cross member I have? here are some pics

first is the two diff side to side the one on the left is the jdm s13 while the one tot he right is the s14 vlsd.

[MasterOFDrift]

here is my crossmember

[MasterOFDrift]

bump still need opnions to a solution. I have a nismo LSD just sitting in my garage AHhhhh

[MasterOFDrift]

come on i need the tech gurus.

[240Degrees]

did you even try switching the rear covers? from my experience, s13 and s14 differentials are interchangable by swapping only the rear covers, basically. I have an s14 vlsd with s13 rear cover on my car now and my old s13 open diff with s14 rear cover sitting outside

[MasterOFDrift]

yes i tried and it did not work. Is ther a difference between a jdm s13 rear differential and a usdm s13 differential cause my s14 cover did not fit on my s13 housing. The cap was clearly too large for the s13 differential.