whats the biggest tire a Dart Sport or Duster will fit with comfortably???

oo ok. i bought rally slots that are 14 by 8s but they wont fit the DAMN cars bolt pattern. there for a 4 inch but the studs are too close in the pattern. i guess i gotta sell them and get some GOOD rims. maybe cops wheels that are just plain but 15s off a ram or something. but only if there wide enough