HELP drum to disk break swap lower ball joint same or diffrent

ok well after looking at a buddys org mopar parts book from his dads dodge dealer
the part numbers are a twin from drum to disk the only change was a d added on it from what i seen
also got my other ball joints in today at the local parts store went there on lunch
and sat down with the guys there had my lunch and looked with 3 other mopar guys
and they were twins mine to disk ones all measurements were exact not close but exact
except for the spindel bolt hole.
he also had a set of new moog drum break ball joints on self same year as others
they were twins also minus the spindel bolt holes

so only difference i seen in all of this was a bolt hole and a letter added to a part number and a littel red card board circle that was on the disk break ball joint stud said
for disk breaks

to each there own and im not saying to drill yours out
i did drill mine out on a mill today and installed them no problems yet but im still building so i will let every one know where i end up in next few days