12:05 Garage- ’70 Duster build
The hub is 3/4" and the rotors are around 3/16-1/4" thick. This meant I needed studs with a long shoulder. The only ones I could find were these ARP studs. $75 for 5! They work perfectly, but go completly against the budget aspect of this project. In the end, I could have bought the aluminum hubs from Dr. Diff for the same money. The rotors that I had turned down were $25/ea. I paid a guy $100 to turn them down into hubs for me, and now $150 worth of studs. He sells his for $300. Oh well. Early on it was proof of concept and losing $150 vs $300 if it didn't work didn't sting as much.
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I've been looking at wheel studs for my brake kit and was looking at this post for other reasons when it dawned on me that when you said you needed studs with longer shoulders, it was because that was how you centered up your rotor wasn't it. I've been noodling how to get the SP front rotor centered on the hub and hadn't thought of that until I realized that maybe that's what you were talking about.
Is this the stud you used?
ARP 100-7707
I did up some tubes on my 3D printer that fill in the space around the current stud on my hub and it seemed to work well, but not sure if I can get them made without costing an arm and a leg. I also setup a ring that piloted on the bevel on the backside of the rotor, but the best price I found to get that made was almost $200 each for metal 3D printed. Machining was significantly more. Not an option.
I also thought about a 3D printed plate that would pilot on the studs and the holes in the rotor and allow for a couple of nuts to be tightened down to lock the rotor and hub together. It would also have a pilot to use to punch the rotor and then the plate could be removed (leaving the nuts) and the rotor and hub could be match drilled and tapped for a small countersunk screw. Biggest issue with this idea is it would make it harder to replace a rotor if something happened 1000 miles from home. Haven't given up on the idea, but your studs make a lot of sense.
Last question, did the hole pattern in the rotor match the bolt pattern in your hub? Can't tell from the pictures for sure. Being that it is an LX/LC rotor, in theory there should be some misalignment. Weird thing is, on my OEM JY rotor, it is definitely a 4.5"/114.3mm bolt pattern in the rotor. Five concentric tubes fit over the studs and the rotor slips on and off easily. Hard to believe they would do that if the hole pattern was 115mm. I wouldn't be surprised if the aftermarket rotors for an LX/LC are actually 5x115mm and the hole in the rotor large enough to fir over the studs, but it appears this OEM rotor from an '06 Magnum SRT-8 had a 5x4.5" bolt pattern.