Replacing 67 Cuda front wheel studs - not so easy

As long as the stud does not spin inside the hub hole, you can use them. They may be somewhat loose, but once the lug nut is tightened down, they are not going anywhere. The ones you see welded - the weld is probably just a tack to make sure the stud stays put when the lug nuts are taken off.

I have found that all those oversize knurl studs are impossible to install, they always seem way too large to me.