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I've got a '68 GT with factory disc brakes. I've changed my wheels and need slightly longer wheel studs. The stock studs are 1/2" X 1". I need 1/2" X 1 1/2". My problem is I don't know the diameter of the knurled area. Summit has a bunch of 1/2" X 1 1/2" studs but the knurled diameter varies. They are: .530, .615, .618, .620, .625, .665, .675, .685. Does anyone know the correct size for my car?
