Hello
I've done that.
I followed the thread on ADVrider on the subject and bought a pair (they are sold like that) of EVITEK bulbs.
They are perfect because the cutoff is perfect and can be adapted to the actual glass of the headlight by turning the bulb in it's fixture.
You do not have to remove the center metallic mask of the light. Only drawback there is an electronic box to install in the headlight so if your Airhead is fitted with the connecting plate in the headlight, this will be problematic.
As per the ADVRider instructions, I contacted the person on the lower page of the web site and she offered a quote for a couple of bulbs. I paid and it took 2 to 4 weeks to have the bulbs in my hand. So keep calm ;-)
AdvRider thread :
https://advrider.com/f/threads/h4-led-by-evitek-f2-has-achived-the-same-focus-as-h4-halogen-bulb-new-2018.1286743/Evitek site :
https://evitekhid.en.alibaba.com/productgrouplist-806384579/F2_LED_HEADLIGHT.htmlHope this helps !
P.S. : I forgot to add that I put LED lights on the gauges and on the dash. The gauges are from Katdash and, now, I can see the voltage or read the time on the clock at night...
For the dash, I bought bulbs with a W10 base and a LED on top. And put them on the speedo and tacho.
Be very careful while doing that because the leds I bought had the two wires showing on each side of the bulb base making a short when plugged into the speedo.
And I was obliged to screw the tacho bulb into it's support in order to prevent it to drop into the speedo case. (it is a PITA to get it out...)