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.

• upn0365 Animal, Dinosaur, Tyrannosaurus Rex with Light-Up Eyes [Complete Assembly] this part is a sub-part of it
• 54213 Animal Body Part, Dinosaur, Tyrannosaurus Rex Body with Black Top and Tan Tail Pair of this part