Leviton Miniature Bi-Pin Base Ceramic Body G4, G6.35, GY6.35, GX5.3 MR16 GZ4 MR11 Halogen Incandescent Lampholder, White 80054 - The Home Depot
Pack of 20,G5.3 / GU5.3 / MR16 / G4 / MR11 Round Ceramic LED Halogen Lamp Light Bulb Socket Holder Base Wire Connector Adapter MR16 (20 Pack) - Amazon.com
Quluxe G4 LED Bulb Socket Halogen Base Ceremic Lamp Holder Socket, Miniature Bi-Pin Base Socket, Halogen Incandescent Led Socket Ceramic Body Lamp Holder (Pack of 10) - Amazon.com
General 28100 - G4 Mini Bi-Pin Porcelain-Halogen Lamp Holder with 5" Leads ( G4 MINI BI-PIN PORC SKT 5" WIRE LEADS D3991) - Walmart.com
MR16 MR11 G4 GU5.3 MR11 Ceramic Base Socket Lamp Holder