Raybestos/ LEXINGTON KY 405 9-51/KY 40511 Rust Prevention Technology Coated Rotor. Item model number ‎KY 405 9-51/ KY 40511. Manufacturer Part Number ‎LEXINGTON KY 405 9-51. Our coated rotors are coated on their entire surface with a proprietary full Grey Fusion 4.0 coating.