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78mm 118mm 135mm 189mm Converter E27 to R7s Base Screw Light Lamp Bulb Holder Adapter Socket Lamp Holder Converters - AliExpress
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Bonlux R7S Bulb Socket 118mm Double Ended Lamp Holder Connector Metal Ceramics Handle for Flood Light, Work Light, Double-ended Metal Halide Lamp, Floor Lamp (5-Pack) - Amazon.com
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