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.
