I have a 1970 dart with small 4" bolt pattern up front. I there a place I could buy new rotors with the big bolt pattern? All I would have to do is swap rotors??? Or does some one have rotor with both patterns??? This has probably been asked before but I looked for an hour and couldn't find any info. I need to get the big bolt parttern setup up front. I did find a set of rotors of a 69 dart with the spindles. I don't want to waste money on the wrong parts.