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.

• 50956 Brick Wedged, Curved 10 x 3 Right this part is a print of it
• 50955pr0001 Brick Wedged, Curved 10 x 3 Left with Red Stripe Print this part is a pair of it