1970 dart right lower ball joint question

I don't know the Moog part numbers, but there are two different disc brake setups the car could have. Kelsey-Hayes four piston discs (small bolt) or late model single piston (big bolt). If you have the KH discs and the bolt holes line up just drill the holes out to 9/16". If you have the later discs you need a '73 ball joint.