I tried a couple of sets. They need to be "slim" to fit into the light unit.
My preferred ones are "OSRAM LEDriving Standard W5W Cool White " I put them in about a year ago after the last cheap chinese/ebay/unbranded ones started flickering.
https://www.osram.com/am/ecat/LEDriv...t/ZMP_4052803/
Very bright, and so far very reliable - i put the same bulb in the motorbike too
Cheap chinese ones off ebay are too unreliable...