Wellp, LuxPro makes a 2×D light which is pretty decent, and I’m using a pair of 3×AA (parallel) holders to burn down half-dead alkaleaks.
Should fit your Vivitars if yer interested.
https://www.amazon.com/LXII-Heavy-Duty-Lumen-Flashlight/dp/B07KCQKSYF/
Plastic front “glass”, but a real glass from a C8 drops right in. Other’n that, it’s pretty decent. XP-G3 in a reflector, so throws a pretty tight beam. I used diffusion film on it because I want just the opposite, something floodier.
And I reviewed it on amazon, so…
Oh yeh, these holders: