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• Zero degree module for use when a module is not used such as MSD 7AL-3 • Retard Module Kit gives you a full selection of retard modules to use with Timing Controls • Kit #8774 includes 5 modules: 11°, 12°, 13°, 14° & 15° • Kit #8775 includes 5 modules: 16°, 17°, 18°, 19° & 20°