Smaller 26650 protected cells?

I recently got a UF-1405 thrower (built/modded by Kloepper Knife Works) which takes 2 of the 26650 cells. I used 2 of my balanced Efest 4200mah IMR 26650’s in it and they work fine. But being a 2 cell light I would prefer to use protected cells.

I have some EVVA 5200mah protected ones that I purchased from Mountain Electronics but they are way too tight to fit into the body of the light.

What are some smaller/thinner protected cells that I should look at?