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
Platinum 5W 12V MR11 GU4 Bipin Base Narrow Flood Mini Reflector Bulb - Walmart.com
Mr11 MR16 DC12V 5W COB Led Spot Light AC12V Gu4 LEDS Spotlights Gu5.3 12V Bulbs Lamp Warm White Pas Erp2.0 - AliExpress
Rosnek MR11 LED Light Bulbs 3W/5W AC/DC12V-24V Halogen LED Bulbs GU4 Bi-Pin Base 1/4/6/10 Pack - Walmart.com