Disc brake problem need help!

well tooljunkle , is it have a 4'' bc with 5 7/16 studs holding the rim on . car steel rims are a bit thinner than p/u rims as well . they can flex enough to pop the wheel covers off . just saying . i had an issue with ssbc disc alloy alum calipers rubbing the rims . i believe that the calipers bodies were cut down on the areas for clearance .