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.

• 30598 Racer Driver Head, Brick Special 2 x 2 Round [Plain] this part is a alternate of it
• 30599pr0001 Racer Driver Head, Brick Special 2 x 2 Square, Orange Eyes, White Teeth, Turquoise Feet (Surfer) Print of this part
• 30599pr0002 Racer Driver Head, Brick Special 2 x 2 Square, White Eyes, White Mouth, Red Steering Wheel (Warrior) Print of this part
• 30599pr0003 Racer Driver Head, Brick Special 2 x 2 Square, Purple Eyes, Feet, White Steering Wheel (Spicky) Print of this part
• 30599pr0004 Racer Driver Head, Brick Special 2 x 2 Square, Orange Eyes, Tan Feet, Yellow Steering Wheel (Rip) Print of this part
• 30599pr0005 Racer Driver Head, Brick Special 2 x 2 Square, Green Eyes, White Mouth, Monocle (Pulse) Print of this part
• 30599pr0006 Racer Driver Head, Brick Special 2 x 2 Square, Red Eyes, White Teeth, Black Hair (Loopin) Print of this part
• 30599pr0007 Racer Driver Head, Brick Special 2 x 2 Square, Blue Eyes, Orange Mouth (Chill) Print of this part