I think BlueSwordM helped Sofirn find emitters for the BLF Lantern.
Regarding optics, Digikey has thousands of the 10507 in stock, but as was noted upthread, it produces undesireable artifacts with at least the XP-L HI.
They’ve only got a couple hundred of the 10511, but say it can be ordered with an 8 week lead time:
https://www.digikey.com/product-detail/en/carclo-technical-plastics/10511/1066-1058-ND/2641674
Mouser has around 1000:
https://www.mouser.com/ProductDetail/Carclo-Technical-Plastics/10511?qs=sGAEpiMZZMt82OzCyDsLFCKTBTJBKqhiN5ShHkyUM2M%3D
Arrow has only 26, but BLF members should keep in mind Arrow has free shipping:
https://www.arrow.com/en/products/10511/carclo-technical-plastics
Off topic, but it’s interesting that a simple 4 mode twisty that had an unimpressive max output even by the standards of 6 years ago did so many things right that it is still worth comparing to one of the most anticipated lights today.
I’ve lamented this before, but I still wish L3 had put the effort into figuring out how to make their lights more robust, instead of just fading away.