Drum brake question

[cheford]

Was wondering if you could help, I used a rear diff from a 1990 2wd silverado that was narrowed and had new axles from Moser made but had them install 1/2" studs instead of the 14 mm to match my front rotors (72 c10). The center hole around the hub is the same size but doesn't fit tight and the stud holes are obviously larger. I was wondering if the earlier drums from the mid 80's that had 1/2" studs would fit my application or did I screw myself