OMTO MR16 GU5.3 GY6.35 Lamp Socket, Common to Miniature Bi-Pin Base G4 G6.35 GX5.3 GZ4 MR11, LED Halogen Incandescent Led Socket Ceramic Body Lamp Holder (12-Pack) (20-Pack) - Amazon.com
10 Pack G4 Light Socket, MR16 Socket, Letaclanic LED Halogen Lamp Ceramic Wire Connector Base Socket Adapter G4 MR16 MR11 GU5.3 GU6.35 Socket (Pack of 10) - Amazon.com
Aluxcia 3W MR11 GU4.0 LED Light Bulbs 12V, G4/GU4/GZ4 Bi-Pin Base LED Spotlight 35W MR11 GU4 Halogen Replacement for Track, Landscape, Cabinet, Recessed Lighting Warm White 3000K, 2-Pack - Amazon.com
E-Simpo 10pcs E26/E27 to MR16/Gu5.3/G4/Gu4 - Standard E26/E27 Edison Screw Base to MR16 GU5.3 G4 GU4 Base Adapter Holder Converter (Ceramic Material) - Amazon.com