911 (76-79), 911 Turbo (75-77) Narrow v-belt, 10 x 725. (911 SC untill engine # 639 9201 and 639 3868)
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air cooling, water cooling
911 (65-75, 79-89), All 914-6 Aftermarket narrow v-belt, 10 x 710. (911 SC from engine # 639 9202 and 639 3869)
911 (65-75, 79-89), All 914-6 Porsche original narrow v-belt, 10 x 710. (911 SC from engine # 639 9202 and 639 3869)