An accurate 8 3/4" rear axle width list

abodyjoe said

you need the abody 8 3/4, the 8 3/4 shock plates and the right length drive shaft.

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Thanks for the reply:
I saw that the 8 3/4 listed here had various lengths, unfortunately my year and body type were t included. Question, are all the 8 3/4 axels for A Bodies the same length?
Also, my car came with a 904 for /6 if Infind a sb 904, do I have to change the drive shaft?
Thank You