More great info. Thanks!
So I had more time to look at it today. I am just thoroughly confused. When I did the disc brake conversion, I didn't change out the hub assembly. I used a setup I found on 7-Bar Salvage's YouTube channel. It is some Suzuki parts and Brennan's garage brackets. The install went fine. I have take the wheels off multiple times and NEVER noticed loose lug studs. But there is no question the lug studs that came off were undersized. I think they are a .629in knurl diameter. Is is possible for a D27A to have a D30 hub assembly? I am going to check, but maybe one side is an actual 27A assembly with the advance threads as @David J.
mentioned? Mine is certainly not threaded on the driver's side front.
I went and got some new ones based on the recommendation above (https://www.napaonline.com/en/p/NOE6411610?impressionRank=3
). I pulled the hub and banged them with a 5lb hammer. There is NO way they could work in my setup a) because the stud head is too thick and therefore would never seat properly in the hole without sticking out and b) the part I have circled in yellow below gets pushed out when I put the rotors on.
below is that part I mentioned is too thick
So assuming that a D30 hub assembly could be on a D27A and that is what I have, is there a better lug stud that would work with the Dana 30, assuming that is what I have?