SMALLRIG 2790 Aluminium Power Bank Holder, Power Bank Mount Clamp for Portable Power Banks with a Width Range of 53 mm to 81 mm: Amazon.de: Electronics & Photo
RuiLing 10-Pack E10 Mini Light Bulbs Screw Base Indicator Light Incandescent Bulb Old-Fashioned Flashlight Lamp for Physical Electrical Experiment 3.8V 0.3A (No Base) - - Amazon.com