6 Pack G4 GX5.3 Lamp Holder Rectangular Porcelain Socket for MR16 MR11 LED CFL Halogen Bulbs with 6" Leads - - Amazon.com
Halogen Light Bulb Bi Pin Quartz G4 G6.35 Lamp Socket 750W Max 120V Max - - Amazon.com
TORCHSTAR G4, GU5.3 Bi-Pin Socket, up to 75 Watts, Ceramic Body with Mica Covers, for LED Halogen Incandescent Light Bulbs, MR11, MR16, Pack of 5: Amazon.com: Tools & Home Improvement
Porcelain Bi-Pin Halogen Socket (47617) - Antique Lamp Supply - Quality Lamp Parts Since 1952