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
Adamax Candelabra to Standard Base (E12 to E26) Light Bulb Adapter A1226E - The Home Depot
LE E12 to E26 Light Socket Adapter, Bulb Base Converter, Pack of 6 - - Amazon.com