Wilwood PS-1 Caliper - LH -12.00" Piston / .19" Rotor / 2.5" Mount R060004Y In the late 90s GM

In the late 90s GM used a funky looking cap and rotor

2020-2024 GMC Sierra 2500 HD Double Cab Pickup

With a 3/8" base thread and a 7/16" rocker thread

312 Inch Thick

Polished / Black Center

Wilwood PS-1 Caliper - LH -12.00" Piston / .19" Rotor / 2.5" Mount R060004Y In the late 90s GMThe PS 1 Caliper is compact, lightweight (. 93 pounds) and combines the strength of cast aluminum construction with a sleek low profile design. This caliper utilizes two stainless steel deep cup pistons to minimize heat transfer from the . 30" thick pad to the brake fluid while employing high temperature square piston seals to control piston retraction. Internal crossover brake fluid passages eliminate the use of external crossover tubes. The PS 1