sorry for my poor explanation, but it seems you figured it out. from my view, the diff in the pics looked similar to my R200, but I could not be certian. I am currently looking for 3 R200 lsd for a few projects I have going. I wondered if these late model center sections would fit. I have recently purchased an rb26dett and still havent decided if it will go into the 240 or the 260. I digress..... what late model center sections are long case? more specifically which late model cars should I hunt for to find a sutiable center section for my 72 or 74. I am aware of relocation issues, moustache bars etc.... I just wanted to get this done without having to buy another C4 center section. Thank you so much for your patience and time on this one. rod.