What stud size for Cragar S/S?

I am putting a 'fresh' 8 3/4 into my 6 banger-73 Duster, getting ready for a nice small block. I had new axles put in, for 2 1/2" drum brakes from an e-body.

I went with the big bolt circle, and the shop put in 1/2" studs. I am going with Cragar Classic S/S, and the Cragar website specifys 7/16" studs.

This doesn't make sense - can't see E Body guys all swapping to smaller studs to go with the Cragars. Can't find any Cragar dealers up here in Canada, so can't check this out 'face to face'.

Interested in what other A Body guys have done with this combo.