HB621S638 for the rear pads.
The Hawk HT-10 is one of Hawk's intermediate motorsport pads, offering more heat capacity than the Blue 9012, less rotor wear, and less aggressive dust.
The HT-10 is a popular pad across a wide range of racing venues, from road racing to pavement circle track. It is commonly used as a front application on light to medium weight cars (up to 2800lbs.)