About this item ? High Quality Copper :The exhaust header collector gasket made of 2.5″ solid copper 0.41″ thick with impeccable durability performance, wear-resisting, anti-strike, anti-scratch, dust-proof and colorfast.without included bolts ? Wide Applicability :This 2 1/2″ Header Collector Gasket are especially designed for SBC BBC 302 350 454, and fit all 2.5 inch collector with Triangle (3 Bolt Pattern). ? [Excellent Sealing Effect]: The exhaust header collector gasket uses a durable composite O-shaped design to form a tight leak-proof seal, without additional sealant, and can seal perfectly every time. ? [What You Will Get]: Includes 2 x 2.5-inch exhaust header collector gaskets for easy installation and operation.Replace old or damaged header collector gasket in time for better performance. ? Aftermarket Service :GSKMOTOR specializes in providing high-performance repair and replacement parts for various automobiles, we support 30 days returns and exchanges. If you have any questions, please feel free to contact us, we will solve it for you as soon as possible, customer satisfaction is our unremitting pursuit.