Step down studs for moser axles

Well, I have Moser axles for my 9 inch, they have 1/2" threaded studs in them. Thats all fine and good if I was running draglites or something all the time. The problem is is I have the Mustang Bullit wheels already and the respective adapters. Does anyone know if the sell threaded studs for the rear that only have 1/2 threads at the shank, and the normal (7/16"?) for the rest? Or should I just get a second set of holes drilled to use smaller studs?

Maybe I could put helicoils or something in the 1/2 holes to put smaller thread studs in. I dunno. I got the wheels and really like the look. I could sell them and buy something similar, but money IS an object right now, lol
 

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