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Part Number: SS39
Grayston metric competition wheel studs, with an M12 x 1.50 thread, with a 63mm length and a 14.3mm splined section. These longer studs were devised to suit the larger spline size on many Vauxhall models, but also popular with many Japanese car owners. They are also often used on Ford's where the spline in the hubs or halfshafts are worn and the studs are loose. In this case you drill or ream out the holes to suit these larger splined studs.