1969-C20 rear drum wheel studs

[BigDwa]

Looking for a little help... I have recently upgraded the front drums to disc brakes on my 1969 C20 using the POL disc conversion kit. The disc conversion kit has 9/16-18 wheel studs. Now I have 9/16 wheel studs on the front and 1/2 wheel studs on the rear drums. I am in the middle of going through the rear differential (Eaton HO52) and drum brakes and need to replace the drum brakes. So, I want to change the 1/2 wheel studs to 9/16 wheel studs so I have the same lugs nuts on the front and back. I have found the correct rear drums (will drill out the hubs) to accept the 9/16 wheel studs, but I am struggling to find the actual 9/16 wheel studs. I have searched here and on google and everything says to use the Dorman 610-190. Only problem is, I cannot seem to find them online anywhere. I have checked RockAuto for other 9/16 wheel studs but nothing matches up to the 1/2 wheel stud dimensions I have removed already.

Any ideas?

Thanks in advance.