The Wilwood Superlite 6R brake kit for 1955–1957 Chevrolet Bel Air applications is specified for 5 x 4.50in/4.75in hubs and includes 12.88in slotted rotors. The Superlite 6R designation identifies the kit's configuration and rotor dimension, making it suitable where that hub pattern and rotor size are required on Tri-Five Bel Air fronts. The overview emphasizes fitment and rotor specification.
Wilwood 55-57 Chevy Bel Air Superlite 6R Kit, 5 x 4.50in/4.75in Hub - 12.88in Slotted Rotor