Amazon.com: UltraPro Porcelain Light Socket with Pull Chain Light Fixture, Light Bulb Socket, Medium Base, Indoor Lighting, Mount on 3-1/4” or 4” Box, 250VAC/660W, UL Listed, White, 18303 : Home & Kitchen
Leviton Part # R60-09726-00C - Leviton Glazed Porcelain Lamp Holder With Pull Chain And Outlet - Replacement Parts - Home Depot Pro
Pullchain Bakelite Lamp Holder – Hoi P'loy
Brass Lamp Sockets, Side Mount - Paxton Hardware
Porcelain Pull-Chain Lamp Holder
Leviton Pull-Chain Socket Lamp Holder R50-19980-0PG - The Home Depot
1 Porcelain Ceiling Lamp Holder With Pull Chain White Bulb Mount Light Fixture, 1 - Ralphs
RDEXP Vintage Lamp Socket with Pull Chain AC 110-240V E27 Light Bulb Edison Pendant Holder Switch (Antique Bronze) - Amazon.com
Eaton 660-Watt Porcelain Pull Chain Ceiling Socket, White in the Light Sockets department at Lowes.com