7.5 to 8.5 rear end swap question

[mobileaudio25]

What are the overall widths of the 7.5 and the 8.5 in rear ends? If the 8.5 in is larger, I am going to purchase wider wheels/tires. thanks, kyle

 

[1980PontiacWagon]

If the 8.5 is from a g body it is the exact same length.

 

[DANZ87MCSS]

just need 1" shorter driveshaft!

 

[SSedan64]

X2^^,
58" WMS to WMS.