Leviton 30 Incandescent Lampholder, Medium Base, Two Piece Porcelain; 660W-600V; Keyless; with Two 8-32 By 1/2 Inch Long Mounting Screws. - Light Sockets - Amazon.com
Leviton - White E-26 Porcelain Lamp Fixture Pre-Wired with Shoulder for Bulb Cage or Clamp