Craftmade Keyless Fixtures and Access. Keyless Lamp Holder in Porcelain - LightsOnline.com
Leviton 660 Wat Medium Base One-Piece Single Circuit Keyless Ceiling Mount Glazed Porcelain Incandescent Lampholder, White 9874 - The Home Depot
UltraPro Keyless Porcelain Lampholder, 2 Pack, Medium Base, Indoor Lighting, Mount on 3-1/4” or 4” Box, 250VAC/660W, UL Listed, White, 54600 - Amazon.com
Legrand - Pass & Seymour - Keyless Lamp Socket, Ceiling Mount Lamp Holder for Indoor Lights, White Lamp Socket, 250 Volts, 660 Watts, Light Socket for Incandescent Bulbs, 276WHCC18, 1 Count - Light Sockets - Amazon.com