widest wheel

I know you wernt BurntOrange.

Just drug home a 70 Duster tonight. It had one 15 inch wheel on rear, not sure if it is a 8 or 10, It has a 275-60-15 on it. The tire is about a 1/4 of spring and about 1/2 of lip.
This is with a 7 1/4 rear, (Does this matter as long as it is a A body rear?)
I could not get the trunk open so I went thru the rear seat and Wholla!!!!
Found the other wheel.

When I get the width and backspace, I will let you guys know. And post pics.

Thanks for the help guys!!