How to confirm the seat type of extended bolts?
Typically, it is the same seat type as the stock bolts you’re using. There are conical seat, R12 ball seat, R13 ball seat, R14 ball seat, flat seat, etc. For the factory wheels, the seat type of the extended bolts must be the same as the factory wheel bolts. For the aftermarket wheels, the seat type of the extended bolts must be the same as the type of the aftermarket wheels. It is essential that the wheel bolts seat and the wheel lug seat match. If the wheel bolts seat type does not fit the wheel seat type, it is possible that the wheel bolts would be bent or damage the wheel.