BEL288 / 288 - Application Notes 73-87 C10 Pickup - 1-1/4" Rotor - (3”, 4”) Notes: - On years 81-87, If brake rotor measures 1“ thick use Spindle #3200 if 1.25“ use #3100. - For trucks w/o O.E. front sway bar w/Hanger kit.