Blade-Tech makes a Kydex light pouch for the 200 lumen E2DL, and this is how I used to carry my E2DL. If the head of the E2DL Ultra has the same dimensions and profile (I do not know if this is the case), then it should fit.
Comp-Tac also makes my favorite Kydex light pouch, but last time I checked, they only offered one for the incandescent E2D, not the E2DL.
Custom Carry Concepts makes a light pouch that is ordered by interior diameter rather than specific light makes/models. I am using one to carry my Klarus XT2C as I type this. You would likely have to order a custom inside diameter.