XRF lower ball joints

I haven't a clue what XRF ball joint brand might be, but if you have a stock Kelsey Hayes, 4 piston, disc brake system, ball joints attatch to the spindle with 9/16 diameter bolts.
DRUM brake ball joints have smaller diameter holes, 1/2 inch diameter.
Since you mentioned the hole diameter is too small, i suspect you received drum brake ball joints, instead of disc brake ones.
Or they were improperly packaged from the get go.