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The Moroso 71900 Spark Plug Indexing Washers are designed for performance enthusiasts looking to enhance their ignition system. These tapered seat washers are available in three sizes - .010", .021", and .032" - to ensure a proper fit for your spark plug. With the trusted Moroso brand and manufacturer part number 71900, you can rely on these spark plug indexing washers to improve your engine's ignition efficiency and performance.