G9 socket halogen lamp socket with rear plug connection and insulating cover M10 x 1 with external thread 20.8 x 2 mm : Amazon.de: Lighting
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