Vintage Off/On Pull Chain Lamp Socket with Solid Metal Cast Shell, E26 Medium Base - royalLAMPSHADES
DEWENWILS Remote Control Light Bulb Socket E26/E27 Bulb Base, Lamp Bulb Socket with Switch for Pull Chain Light Fixtures - Walmart.com
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