Hanpearl Round E27 White LED Lamp Screw Base Halogen Bulb Holder Converter Light Bulb Base Lamp Socket Adapter (10 pcs) - Amazon.com
4Pcs Halogen Light Bulb Base Socket Practical G9 Ceramic Lamp Base Holder - Walmart.com
12v 50w halogen bulb holder GU5.3 lamp socket
ODETOJOY G9 Light Bulb Socket Ceramic Lamp Base Holder Connector Led Halogen Light Lamp Bulb Holder Base with Cable Lead (1): Amazon.com: Tools & Home Improvement
Source 2 in 1 Lamp Holder Bulb Holder Dual Double 2X E27 Socket Base Extend Splitter Plug Halogen Light Lamp Copper Contact Adapter on m.alibaba.com
MR16 Halogen Lamp Socket mini bi-pin 12V ceramic lamp holder