Hi,
I presume you are looking for E-Series tubes.
The Aleph Powerpacks can come in handy if you know where to look.
Here is a
Li-ion 17500 body that can be used with 2xCR2`s aswell.
Its black so it wont match any of the Nat Surefire heads.
They used to have Single cell CR2 packs,but they are long gone,not sure if they will replenish the stock.
Another more costly solution is to buy parts here.
What makes it more costly is the
TnC SF Natural HA power pack to fit Aleph heads
You need this to mate the Powerpacks they sell to your favorite E-Series head.
TnC SF Natural HA 18500 battery tube (Also fits 2xCR2 batteries)
TnC SF Natural HA CR2 battery tube
All these tubes fit the E-series Tailcaps to my knowlege,but i havent tryed yet.So dont take my word for it.
Maybe someone else can comment on this.
Regards,
Benny