6 Pack G4 GX5.3 Lamp Holder Rectangular Porcelain Socket for MR16 MR11 LED CFL Halogen Bulbs with 6" Leads - - Amazon.com
2" Downlight Fitting Holder, Baffle Trim with MR16 GU5.3 Lamp Holder, White - Overstock - 36801294
GU5.3 G4 MR16 MR11 Halogen lamp LED Bulbs Lamp Holder Base Socket Wire Connector | eBay
MR16 Sockets and Lamp Holders - Lighting Accessories – BulbAmerica
MR16 Halogen Lamp Socket
FINELED MR16 to GU10 Adapter Converters Light Sockets Lamp Holder,MR16/GU5.3 To GU10 Light Bulb Base Socket Lamp Adapter Utilize GU10 Base Bulbs in a MR16 Socket - - Amazon.com