Leviton Brand E-26 Medium Base Porcelain Threaded Skirt Lamp Socket with 1/8ips Cap.
Leviton Glazed Porcelain Lamp Holder with Pull Chain and Outlet R60-09726-00C - The Home Depot
Ceramic Ceiling Light Bulb Holder E27 Portalamparas Screw Lamp Socket White Black Porcelain Bulb Base Fittings - AliExpress
Amazon.com: UltraPro Porcelain Light Socket with Outlet and Pull Chain Light Fixture, Light Bulb Socket, Medium Base, Grounded Plug, Indoor Lighting, Mount on 3-1/4โ or 4โ Box, UL Listed, White, 18305,1-Pack :
E26 Medium Porcelain Lamp Socket with 1/8F, 1/2" tall metal hickey and โ Antique Lamp Supply
Antique Light bulb in porcelain socket Photograph by Jack R Perry - Fine Art America
Eaton 660-Watt Porcelain Keyless Ceiling Socket, White in the Light Sockets department at Lowes.com