The light linked will not take a 26650 if it takes 3 x AAA without a sleeve which it does not appear to. The sleeve in the picture is an adapter to take a single 18650.
I've just modified 4 lights that appear identical to this light to get rid of next mode memory and removed the spring from the driver so protected 18650 battery's can be used. The pills in mine were hollow.
Maybe try a Uniquefire UF-1405. The units from GearBest takes two 26650 batteries, but it runs off an XM-L2 LEDs. My copy of this flashlight could throw about 700 feet. Swapping out the LED and Driver I am now able to throw about 2500 feet.
That comes with an XM-L2 U2, so you’d need to get someone (or you could do it yourself) replace the emitter+star with an XP-L of your choice.
BTW, why are you looking for 2x26650? Those would presumably be in series, so you wouldn’t get any runtime advantage.
If you’re really saying that you’re looking for just a 26650 light, then either the Yezl Y3 configured for 1x26650 or maybe an HD2010, with an XP-L swapped in, would do?