I was looking at a rim and came across this: "These rims will only fit with 12x1.50 mm threads size, if your car has another thread size, you may need a stud conversion kit to fit these rims." The rims are 18x7 with a 40+ offset. I may need spacers, or heck, they might not even fit at all.. but it's still a learning process for me with things like this so an explanation would help.
12X1.5mm is the thread pitch of the studs and lugnuts. I sell wheels, tires, and auto service for a living and I've never seen any kind of disclaimer like that. I'd buy from someone else.