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.

• 73037c01 String Reel Winch 2 x 4 x 2 (Light Gray Drum) with String and Light Gray Crane Hook Left this part is a sub-part of it
• 73037c02 String Reel Winch 2 x 4 x 2 (Light Gray Drum) with String and Dark Gray Hook with Towball this part is a sub-part of it