(38 mm are much dearer needless to say) Happy to try and help!
1/2" Male To 10mm Female Brass Lamp Holder M10 Thread Reducer Bush Adaptor
M10 10mm Brass Lamp Holder Fixing Kit 50mm Threaded Rod with Hex Nut and Washers
sourcing map E27 Double Base Bulb Socket M10 Thread Lamp Holder 2 Light Socket with Bracket Light Fixture Wire for DIY Lamp Accessories Ceiling Lamp
sourcing map E27 Medium Base Bulb Socket M10 Thread Lamp Holder 3 Light Socket with Bracket Light Fixture Wire for DIY Lamp Accessories Ceiling Lamp Pack of 2
2Pcs E27 Double Base Bulb Socket Adapter M10 Thread Lamp Holder 2 Light Socket
E27 Double Base Bulb Socket Adapter M10 Thread Lamp Holder 2 Light Socket
