Amazon.co.jp: Bulb Socket 5.0PCS MR16 G4 Ceramic Lamp Holder Socket Connector LED Halogen Adapter with CFL Wire Plug Adapter : Home & Kitchen
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Amazon.com : E-Simpo® 12pcs MR16 to Gu10 Light Socket Adapter, LED Halogen MR16 to GU10 GU5.3 to Gu10 Spotlight Lamp Base Holder Converter, Need Remove MR16 Transformer if Old MR16 is 12V