Don't use metric wheel studs on your muscle car to bolt on your late-model GM aluminum wheels. These special lug nuts feature an English 7/16 internal thread and a metric M24x2 external thread for late-model center cap retention by the thread-on plastic lug nut covers. The 60-degree tapered seat of these lug nuts matches the angle of late-model GM aluminum wheels. GM switched from the 7/16 wheel stud thread to the metric 12 by 1.5 design around 1982 for rear wheel drive cars and trucks. Check your application to ensure compatibility.

These OEM 0.140-inch thick wheel spacers provide additional tire clearance between the inner wheel well or frame. They are great for use with a larger-size drag radial or wider street tires. The inboard side of spacer has a counter-bore around each wheel stud hole to clear the factory-installed star washer on wheel stud. Spacers are sold in pairs and fit 5 X 4.75 bolt pattern GM vehicles. Can be stacked together for additional clearance. (Check to ensure adequate stud length when using multiple spacers)