Amazon.com: Leviton 55 Weatherproof Lampholder, Single Circuit, 660W-250V; With Two 6 Inch Leads, One Black And One White, 14AWG 60C 600V, Free Ends Stripped 3/4 Inch. : Industrial & Scientific
Leviton Porcelain Lamp Holder Medium Base Light Socket 660W/250V | eBay
Leviton 124-D Incandescent Lampholder, Medium Base, Single Circuit, 660W- 250V
Sockets — Lighting Renewal
8827-CW4 Leviton 660W/250V Medium Base One-Piece Urea Outlet Box Mount Incandescent Lampholder, Pull Chain, Single Circuit, 2 Screws with Captive Clamps, Top Wired - White