Nuvo Black Universal Bulb Holder Track Head - #74M44 | Lamps Plus
Nuvo White Mini Universal Bulb Holder Track Head - #74M45 | Lamps Plus
Amazon.com : Neewer E26/E27 Lamp Holder with Light Stand Mount, Porcelain Socket and Umbrella Holder, Studio Photography AC Socket for Lamp Bulb Light Stand, 2 Packs : Electronics
Nuvo Brushed Nickel Universal Bulb Holder Track Head - #74M69 | Lamps Plus
Amazon.com : Neewer E26/E27 Lamp Holder with Light Stand Mount, Porcelain Socket and Umbrella Holder, Studio Photography AC Socket for Lamp Bulb Light Stand, 2 Packs : Electronics