These 10-1/2 racing clutch discs for GM applications are the perfect choice for Hobby or Street Stock racing. Organic solid hubs. Tech Tip:When installing a new clutch be sure to follow the manufacturers instructions for correct set-up. You should also replace the pilot bushing/bearing. Tech Tip: To extend the life of your expensive racing clutch you should not use it to load the car on or in your trailer. The amount of slippage this causes is worse than a night of racing. Item Details1 5/32 -26