4 Piston Brake Question

I just recently switched my front drums to Kelsey-Hayes discs. In order to mount the calipers, you need the disc spindle. You should also get the heavier ball joint. The spindle for the drums uses a bolt diameter of 1/2". The bolts for the disc spindle have a diameter of 9/16". We drilled out my ball joints to get the job completed, but ordered new ball joints the same day. I have 14" wheels and have no clearance issues.