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2 Sets E26 E27 Lamp Saddle E14 E26 Socket Ring and E27 to E14 Lamp Holder Ring Adapter Kit for Light Socket Ring Retainer Rings and Replacement [FDXGYH] - - Amazon.com
E14 Lamp Shade Collar Rings,JNXQWE Light Socket Ring,E14 E12 Lock Socket Replacement Adapter Ring with Inner Diameter of 1.1Inches(28mm), Retainer Rings for Light Fixture (4, White) - Amazon.com
Uxcell E26/E27 Light Socket Rings Lamp Shade Holder Adapter Ring Replacement for Light Fixtures White 6 Pack - Walmart.com
E12 Lamp Shade Collar Rings,JNXQWE Light Socket Ring,E12 E14 Lock Socket Replacement Adapter Ring with Inner Diameter of 1.1Inches(28mm), Retainer Rings for Light Fixture (6, White) - - Amazon.com
Metal Lamp Shade Reducer Ring / Light Fitting Washer / Adapter /Converter Plate | eBay
G9 Light Socket Rings Lamp Shade Holder Adapter Ring with Removal Tool - White, Black - - 38008125