OZXNO 1-3/8 Inch Lamp Shade Collar Rings 2pcs E26 Light Socket Rings Retainer Rings and Replacement Adapter(Black) - Amazon.com
E26 shade ring barrel adapter
Light Socket Shade Rings,Aluminum Threaded Socket Ring for Medium Base E26 Sockets,Retaining Rings for Glass Lamp Shades/Light Fixtures (4-Pack White Color/For Thread Diameter 1-1/2 Inches) - Amazon.com
Uxcell E26/E27 Light Socket Rings Lamp Shade Holder Adapter Ring Replacement for Light Fixtures White 6 Pack - Walmart.com
E26 Socket Ring LUORNG 6PCS E26 /E27 Black Light Socket Ring, Lock Socket Replacement for Standard Base Threaded Lamp Holder, Bulbs Edison Retro Pendant Lamp Holder,Lamp Shade Collar Rings - Amazon.com
6pcs E26 Lamp Shade Socket Ring Removal Tool Shade Holder Rings Replacement Tool - Black - Overstock - 38007967