1 to 2 Lamp Holder Bulb Holder Dual Double 2X E27 Socket Base Extend Splitter Plug Halogen Light Lamp Copper Contact Adapter _ - AliExpress Mobile
Bakelite Lamp Holder with flange (E27) | White - Kynda Light
Legrand-Pass & Seymour 8101CC10 Medium Base Incandescent porcelain Lamp Holder, Keyless, Single Circuit, 2-Piece Ring with Leads 1 3/8-Inch to 1 1/2-Inch Hole - Light Sockets - Amazon.com
Phenolic Shell Lamp Holder with 1/4 IP threading- 1 way – My Lamp Parts
HH 1-926RW-2 - T8 or T12 Medium Bi Pin Socket | CityLightsUSA.com
Plastic Lamp Holder, Pull Chain, 1-Piece Medium Base, Outlet Box Mount (2 -Pack)