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.

• 3001apr0001 Brick 2 x 4 with 4 Plane Windows in Thin Red Stripe Print this part is a mold of it
• 3001e Brick 2 x 4 with Slotted Bottom Tubes this part is a print of it