Source 2 in 1 E27 Y Shape Lamp Base Fireproof Material Holder Converter Socket 2E27 Light Bulb Splitter Adapter Light Bulb Base Holder on m.alibaba.com
Dual E27 Base to E27 Base Socket Adapter | Super Bright LEDs
E-Simpo G24d to E27 Adapter, 2P Light Socket Adapter, 21.8mm,G24 to E26/E27, GX24d to E27 Lamp Base Converter, Rohs.Need Bypass The Ballast! (60-Pack) - Amazon.com
CLWHJ-360 Degrees Adjustable 2 in 1 E26/E27 Splitter Socket Adapter. E26/E27 Standard LED Bulbs 360 Degrees Adjustable 180 Degree Bendable Max Watt 120W( 2 in 1) - Amazon.com