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.

• 54007c01 Duplo Car Base 2 x 6 with Four Black Wheels and Dark Red Hubs with Yellow Stripes Print this part is a alternate of it
• 54007c03 Duplo Car Base 2 x 6 with Four Black Wheels and Flat Silver Hubs this part is a alternate of it