1967 Dart differential question

ok, well im more confused than ever now. Lol
I looked at it and comparing it to pics im finding online, it looks like none of them
the cover has 10 bolts. no drain plug on the cover. i couldnt really see how it could have 6 sides to it. Not oval. bolts are evenly spaced.. Its looking like im gonna have to get that car up in the air and find the numbers off of it.