Backspacing and Offset - the never ending headache of wheel shopping

If you don't have to have a 15"wheel, check out late model mustang wheels (maybe torque thrust M for mustang) . They have the 5 on 4.5 bolt pattern and more backspace than the typical musclecar wheels. 17x7 or 8.
I kind of have my heart set on 15” Weld Prostars like the blue Dart in the link I posted.