A body measurements

Hi guys geting a good amount of emails on 8 3/4 a body rearends.What I would like to know what are the measurments on this rearend from one spring pearch to the outher,drum to drum.Are all 67 to 72 SB axel rears the same.Some people will tell you anything just to sell what they have.I had one guy ask what year car do you have and said ya this will work.Thanks.Guys.