I’ve been using a Surefire E series bezel and a Veleno Designs E-Series tower module with a Vital Gear FB-1. I wanted a brighter light, so I bought a Vital Gear E to C adapter that enables the use of a P60 style dropin. When I screwed on a Surefire Z44 bezel, it made the front end of the light a little larger than I wanted.
Valiant Concepts makes the VME Malkoff Valiant Concepts Head that fits on an E series body and enables the use of a Malkoff Devices M series dropin lamp assembly. The VME head includes a lens for dropins that don’t have one but I use it with a Malkoff M60, which has a protective lens as part of the optic. I modded my M60 with a driver that enables three modes. The diameter of the VME head is slightly smaller than a Z44 bezel – 1 1/8″ vs 1 1/4″ (28.5 mm vs 31.6 mm) – which doesn’t sound like much but it makes a difference. With the modded M60, the flashlight is a lot brighter and also throws further than the Veleno Designs module.