MR16 (GU5.3) MR11 (GU4) & G4 Low Voltage Bulb Holder - BrightOn LED lighting
LEDVANCE OSRAM Lamp LED ST MR16 3.8W/2700K/GU5.3 12V
E-Simpo 10PCS E26 to Gu5.3/GU4/G4/MR16 Adapter- Standard E26/E27 Edison Screw Base to MR16 GU5.3 G4 Gu4 Base Adapter Holder Converter (PBT Material) - - Amazon.com
GU4 / MR16 - MARINELED
10 MR16 GU5.3 MR11 GU4 12V version with cable | ledtech-shop.com