Yeah the heat exchange fins were just an older auto trans thing. Not sure why they would use them on only the rear diffs with auto trans, but that's all I saw them on. Any R160 diff cover will bolt right on.any r160 cover should be the same, ive never found any that werent compatable
I think a picture would help at this point...no bolt pattern is very different the 95 diff in my car is about a half in wider on either side then the normal r160 diff. its taller also.