I wouldn’t think the search is impossible.
Looking at the Ohmmu Battery Specs in indicates their Model X LiPo4 Battery is 190mm x 121mm x 205mm
NS40LMF Batteries have similar dimensions of 182mm x 127mm x 199mm
These are commonly used in latest Gen Prius etc…
Obviously the AGM Style Chemistry from Tesla, or LiPo4 Chemistry would be better, but I reckon the Model X would run fine on one of these.
TOYOTA Ascent 2000-on. Corolla Accent, Levin, Ultima (South Africa) 1999-on. Prius Ⅰ＆Ⅱ 2001-2006.
My Model S ran fine on a similar Century Battery for around 3-4 months until I decided to change it back over to the Tesla one.
(Just because it was in at the Service Centre)