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.

• 30599 Racer Driver Head, Brick Special 2 x 2 Square [Plain] Alternate of this part
• 30598pr0001 Racer Driver Head, Brick Special 2 x 2 Round, Brown Horns, Triangle Eyes, White Teeth Print (Shredd) Print of this part
• 30598pr0002 Racer Driver Head, Brick Special 2 x 2 Round, Green Eyebrows, Red Eyes, White Teeth Print (Scratch) Print of this part
• 30598pr0003 Racer Driver Head, Brick Special 2 x 2 Round, Yellow Lightnings, Blue Eyes, White Teeth Print (Lightor) Print of this part
• 30598pr0004 Racer Driver Head, Brick Special 2 x 2 Round, Yellow Eyes, White Teeth Print (Snake) Print of this part
• 30598pr0005 Racer Driver Head, Brick Special 2 x 2 Round, Orange Eyes, Black/orange Eyebrows, White Teeth Print (Gear) Print of this part
• 30598pr0006 Racer Driver Head, Brick Special 2 x 2 Round, Goggles, Yellow Flames, White Teeth Print (Duster) Print of this part
• 30598pr0007 Racer Driver Head, Brick Special 2 x 2 Round, Goggles, Silver Flames, Dark Tan Teeth Print (Freeze) Print of this part
• 30598pr0008 Racer Driver Head, Brick Special 2 x 2 Round, Red Teeth Print (Ghost) Print of this part