What version of Leto are you using? If I recall, The most recent one which supports 1.69 has a list of what models are associated with what number. Granted, it won't be able to tell if you're using CEP or some other appearance modifying hak.

Yeah I tried 1.69. It has all the base nvn models listed in the xml containing the numbers for associated models and such, as you said doesnt list cep stuff.
Oooh idea... they are npcs you can hire in the mod so maybe i can use letos npc to pc converter and tinker with that. Will give that a shot.

That didn't work. Using the advanced editor i found it uses certain values that dont work , like appearance ID 752 (which in the hak is used for the male fox fella) is a upscaled gnome model i think according to Leto and trying to load up the bic after conversion crashes/hangs up the game on trying to load up any module with said character.
Wonder if theres a workarond to get the actual model id from cep and use it using the advanced editor. Will investigate further, let me know if anyone else has an idea.

If you create the character you need, and export them from the toolset, you can load their erf file into Leto, and they should retain their numerical values in Leto's Advanced Editor. Mind you, if the module you're trying to enter doesn't have CEP, you won't look like what you're supposed to. I do this all the time for CEP wings/tails/models, so it is a confirmed method

EDIT: 1852 is Braveclaw (male). 1851 is Kathnee/Heartshot (female).

Thank you so much, ill get right onto trying it out :D