long wheel studs for factory discs
Here's the thread about the ones that Pentastar used to carry.
Kelsey Hayes longer wheel studs
There's probably some other supplier, but our Australian friends would know better.
If going that route, I'd have bushings machined so the Aussie studs would be in double shear when installed on the K-H hub-n-rotor.
Another option is to have a set machined like this guy did.
Kelsey Hayes brakes long wheel studs
Everything I've read says threads formed into previously heat treated stock have much greater fatigue life compared to cut threads.
So again playing it safe, IMO it would be worth calling this company about having a set with rolled threads rather than cut threads.
They even specifically mention wheel studs.
Wilson-Garner American Made Wheel Studs