I am interested in a set of Torque Thrust D's, Steel Styled Wheels or Magnum 500 for my 1965 fastback. I have lower the car 1". I want to put 15" rims on the car and am wondering if there are requirements I have to follow (off set) for purchasing rims. I am looking for used rims and am wondering if I can buy any set that I find. Can anyone tell me the off set I need to follow?