SBP LBJ Question

I'm installing SBP disk brakes on my '64 Dart and have encountered an issue with the lower ball joint.

I purchased new LBJ's from Ebay but the holes to mount them to the spindles are smaller than the bolts that screw into the spindle. Were my disk spindles drilled/tapped for some reason or do I have the wrong lower ball joints?

The holes are the same size as for the drum ball joints. If I can re-use the drum LBJ's then I will because they are practically brand new with only a few hundred miles on them. I hesitate to just drill the holes larger for strength reasons...

If these are simply the wrong ball joints I will contact the seller and see if I can return them and get my money back.

Thanks.