Variants of a mold are catalogued separately, so each one has its own sets and minifigs. Check these too if something you expect is missing here.

• 18946 Technic Gear 16 Tooth with Clutch on Both Sides this part is a alternate of it
• 6542a Technic Gear 16 Tooth with Clutch [Toothed] this part is a mold of it
• 18947 Technic Driving Ring 3L this part is a pair of it
• 2473 Technic Driving Ring 2L, 8 Ridges Pair of this part
• 32187 Technic Driving Ring Extension, 4 Ridges this part is a pair of it
• 35186 Technic Driving Ring Extension, 8 Ridges this part is a pair of it
• 6539 Technic Driving Ring 2L, 4 Ridges this part is a pair of it