Need new stud, but confused...

Last year, I had some work done to my car, including the replacement of my drivers side front wheel bearing. I'm not sure what "Quality" of bearing the mechanic I used replaced it with, but when I brought my car in for an oil change/tire rotation, they broke the stud on that exact wheel bearing. Had a friend of mine who's a mechanic take the brake assembly apart to replace it with what we thought would be the appropriate new stud, one that is for an OEM bearing, but it spun like a... I'm going to leave the expletives out! Anyway, I wanted to know if anyone else ever had to replace the WB and a stud broke, and if so, where did you find the replacement? We tried about three different studs and none of them fit correctly so I'm kinda at a stand still on this one. Thanks!