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
Ceramic J118 R7S Linear Halogen LED Floodlight Light Bulb Lamp Socket Holder | eBay
Bender Wirth BW 990 Halogen Lampholder, G4 Square Ceramic Socket with Side Contact Wires