@SPF Required
dunno your answer exactly, but my experience from memory is
six inch width, 14 or 15 inch diameter, steel wheels from American OEM's to be ~
4.0 inch "backspacing" (bksp), which is about an inch of positive "offset".
Boiling all that down, a 14-15 inch diameter (6,7, or 8 inch width) Magnum (or any wheel), with 4.0 - 4.25 inch
bksp, , with tire NO "wider" (e.g., like a 255/60, or about ~10 inches) and NO "taller" (e.g., like a 215/70 or 225/70, or ~27-28 inches in diameter), you should be golden -
IMHO.
You'd have to make a aesthetic choice on what "look" (e.g., big & little, all same size, fat or thin, etc.,) you wanted, and
not worry much/at all about interference on an
UN-modified slabbie.
hope that helps. good luck chief.