187cBs13

ok so i went to the junk yard and i think i found some lsd but i need some questions awnsered theres a j30 j30t and a m30 there i think they all are suppost to have lsd but the j30 ans j30t are five lug and the m30 isnt but mt q/ is can they fit in a s13 and how hard is it my best bet would be the m30 so i donr have to search for axles