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.

• 2991b Technic Brick 1 x 2 - 1 x 2 Angled with Bumper Holder [Open Front] Mold of this part
• 70962 Technic Rubber Bumper Angled 2 x 2 - 2 x 2 Pair of this part