JZX NZ

I have a problem. I have a standard na auto 1jz and it has a b04a diff which means i only do single peggers. Where do i find an lsd diff to bolt into my car and what diff code am i looking for if I go to a wrecker??

I dont think its either. Its a base model cresta ill have a look for the diff code in the morning

Hey guys ive recently purchased a jzx90 cresta and its got the worst open diff. Just wondering what bolt in diffs can i get that are lsd. I read somewhere altezza diffs fit just want to make sure