Narrowing an 8 1/4" rear end, how is it done?

You can contact Stevens Performance Used parts (256-247-1332) I believe they may be the closest.
They are in Alabama if I remember. A body used housing either 8 1/4 or 8 3/4 he may have.
I needed 1 3/4'' small bolt a body 10'' drums before they were reproduced. He had 'um.
Just a thought.