2nd gen f-body backspacing "DSE Mini-tubs"

[Doug1]

Have to get the hoops welded on to the centers and need to provide the manufacturer with measurements. Wheels are 18s on the front and 19's on the back. I'm pretty sure I can get 10" width on the front and 11"s or 12" on the back but I'm not very good at determining backspacing. I know a bunch of people have DSE mini-tubs in their 2nd gens. Can some of you clue me in on the backspacing you used?