Thank you! Could you measure reflector depth, diameter and opening diameter? Looks like KD doesn’t offer replacement one, so it will be bit risky to put XHP70.2 inside due to some drilling. I also haven’t found replacement one on ali. Still I’m eager to try 70.2. Haven’t found 25mm TIR for this led though…

Anyway manta-ray driver with reverse polarity protection and better modes will suite bike better:
https://aliexpress.com/item/32897809607.html
Looks like same as this one but cheaper:
https://aliexpress.com/item/32853667712.html
In contrary to convoy S21a, KF8 can take 22mm so they will fit, that’s nice.

Does tail of light use same thread as body? What’s depth of driver compartment? What is internal diameter of reflector tightening ring?