G4 GU4 GU5.3 LED & Halogen Fassung/Sockel für Niedervolt Lampen 12V/24V (G4 Sockel schwarz, 10 Stück) : Amazon.de: Beleuchtung
DEMASLED 10-Pack Mini Bi-pin Socket Led Light MR11 MR16 Halogen Bulbs Base lamp GU5.3 G4 GU4 GU5.3 GU6.35 GY6.35 GX5.3 GZ4 - - Amazon.com
12V socket for gu5,3 and gu4 led and halogen lamps - R&M Lighting
E27 to G4 / GU4 / GU5.3 adapter
Gu5.3 G4 Lamp Base Adapter | E14 Mr16 Base Adapter | E14 Mr16 Lamp Holder - 4pcs E14 - Aliexpress
10 MR16 GU5.3 MR11 GU4 12V version with cable | plentyShop LTS
E-Simpo® 6pcs E14 to MR16/Gu5.3/G4/Gu4 Adapter EU Candelabra Base E14 to MR16 Spotlight Bulb Base Holder Socket Converter,Ceramic, Make Sure The MR16 Lamp Working Voltage is The Same as E14 Socket - -