Sierra Distributor Caps are injection-molded, glass-filled polyester with a high-luster finish for a complete, high-quality cap. No tune-up is complete without a quality distributor cap. Sierra uses material that retains high dielectric strength under elevated temperatures with brass inserts to eliminate the formation of aluminum oxide. Caps are molded with perfect roundness assuring a better fit. Key Features Brass inserts eliminate formation of aluminum oxide Injection-molded, glass-filled polyester for high dielectric strength Close tolerances assure a perfect fit Backed by SeaStar Solutions Two-Year Limited Warranty How to order the Distributor Cap you need Click the dropdown menu above and select the Sierra part number you want If you do not know the Sierra part number, proceed to our Engine Parts Selector, where you can search by OEM part number, engine manufacturer, model number, year, horsepower, and serial number.