New circuit board needed STL-V2/FF STL-V6

Can anyone point out a replacement circuit board for an STL-V2. A link would be great

Thanks.

I forgot size of diameter, but if 26mm .

http://www.fasttech.com/products/1612/10005161/1404708-tr-0124b-84v-5-mode-led-flashlight-driver-for-lumi

Just looked at the driver. Says 4 amps on high! I wonder how accurate that is. I think the original driver in the STL-V2 is pushing what? 3 amps?

Is a 4 amp board compatible? Would this mean higher lux/lumen output and shorter runtime?