Help!
I’ve lost my nerves searching for one.
Is there anybody who knows where to get them? Aiming in 17/20 mm.
Any hints on Leds and resistors are welcome too 
The Astrolux model is available on Banggood and Simon sells two versions (five models) in his official Convoy store on aliexpress. I think 16mm is the norm (the Astrolux and earlier Convoy are that size). The newer Convoy 20mm measures at 19.7mm on the two I have.
I think the couple of member projects here are dead now (Lexel and Led4Power I think…not sure if we’ve had more).
Thanks. I know where to get them fully assembled. But I’m looking for just the pcb to solder there components bought separately.
Just desolder it and replace LED. I think to mod one of these PCB with UV leds. My last mod from yesterday it is to use light switch with transparent rubber button for my M21B. I think it to replace it with GID version and UV leds will be great to illuminate rubber when light is turn off and the rubber will glow when the light is on. Ithink if you write to Simon there is maybe possible to sell to you bare tail switch PCB. Also I can confirm Convoy 18650 light are with 16mm PCB in tail and for 21700 version it is 20mm.