What the heck is up with 8-3/4" rearends?

Where are the part numbers located on the 8 ¾ housing for an A body?
Does anyone have the 64-69 and the 70 and up part numbers.
I have one in my 66 barracuda and would like to know what year and make it could be from.

Thanks
Dan

Does anyone have an answer for this question?