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.

• 4802 Duplo Door, Top Sliding for Building 6 x 16 x 6 this part is a pair of it
• 4807 Duplo Door 1 x 4 x 4 with Porthole and 7 Vertical Grooves Pair of this part
• 4808 Duplo Door / Window Narrow, 1 x 3 x 2 1/2 with Four Panes Pair of this part
• dupupn0043 Duplo Door 1 x 4 x 5 with Porthole and 7 Vertical Grooves Pair of this part