It looks like you bought the primed version at LMC. Looks like you paid about $440 plus shipping for them. These are nowhere near an actual GM 15 x 8, 6 lug on 5.5 bolt circle,10 slot, genuine Rally wheel. The GM center hole lip turns outwards and the back side has smooth rings that allow for a nice flat fit with standard truck studs. They also have three tapped holes for caps. If it's not a GM Truck Rally, It's not a Rally wheel. Many people call lots of wheels "Rally". Most of the time it's a scam word. It means nothing.
You can buy a set of these real Rally's, in good condition, for same or less $$ from Ebay or Craigslist. Sometimes you get trim rings and caps. I would recommend that if LMC offers, that you send them back ASAP. Truck Rally's didn't come out till 67, so they may have you there on the stud length. Your studs look extremely short, like there is something you are not telling us.
Genuine GM 6 lug Truck Rally's are VERY carefully NOT reproduced.
So I'm definitely not hiding anything. Why would I do that? Sure they may not be genuine Rally wheels, but that's what LMC called them, so I used the name for reference. I'm building a tribute truck, not original.
I did some measuring and found something interesting. The rear studs are 3/4" long, from the face of the brake drum. The front studs are 1" long from the surface of the brake drum, so 1/4" longer.
The lug lugnuts I purchased at a local auto place are 3/4" long. I counted turns when tightening the lugnuts and they turn 8 revolutions. I didn't have time to see how far in parts of an inch that is.
It's interesting that the front lugs are 1/4" longer, but maybe that's normal, I don't know. At this point, still waiting to hear from LMC, but thinking this is going to be different lugnuts or longer studs at least in the rear.
