Body host for Balder SE-2 pill (XM-L), very wide spill, 18650

Hello,
I had problems with my SE-2 light, and got new pill, driver + LED. There was a problem with working on low and self-switch.
However this still can be used, so I’m looking for a cheap body that I can put the pill into. I have never done this before, but I think there is some kind of standard for pill/body size? So which body would fit my SE-2 pill?

I’d like something for less than 15$.

I thought about this one (C8 Q5 Ultrafire, 5,99:money_mouth_face:. + buy new glass + reflector + springs.
Need it as a second bike/camp light. With wide spill, like LED without any reflectors.

PS. Can I use thermal paste from PC for my DIY flashlights?