Leviton 660-Watt Keyless Twin-Socket Lamp Holder Adapter R52-00128-00W - The Home Depot
Wholesale E27 to 2e27 Lamp Holder One Point Two Lamp Holder Twin Lamp Socket E27 to Double Head - China E27 to 2e27 Lightholder, 2e27 Lamp Socket | Made-in-China.com
Black twin entry Porcelain E27 festoon lamp holder