Lower ball joint holes too small for my Kelsey Hayes spindle bolts.

I have a Kelsey Hayes disc brake set up. The problem I am having is that I ordered the lower ball joints specifically for this application. However the bolt holes on the ball joints are smaller than the bolts that mount on the spindle/ knuckle. I think the holes are 1/2” and the bolts are 9/16”. Every source that I have checked says that these ball joints are correct. Any help would be appreciated.