This adapter converts a GX23 socket into an E26 medium base socket. Note that the ballast in your fixture needs to be removed or bypassed for correct operation. If you are uncertain, please seek advice from a professional electrician.
GX23 to medium base adapter
Converts a GX23 2-pin CFL socket to E26 Medium
Ballast must be removed or bypassed to operate LED, incandescent, or halogen bulbs.