Alright for anyone having this issue, comet2 in on patchday13
What I've been doing is searching for the models using OpenIV search bar, and replacing all the ytf and ytd files with the modded ones.

@JohnFromGWN Thanks for you reply! I get why Addon cars shouldn't work, the thing is I've been installing replace cars only. As well didn't modified the ytf, ytd files' names (example having a replace car for nineF and change it to comet2). The most reasonable thing is there's another location for these files, but where are them who knows.

Hello everyone,

I'm currently replacing a lot of cars to their real version (thanks to the community for all the excellent and super detailed mods).

So at first I installed a few, like 48 or so, then I opened the game and when spawning them some of them didn't work. When searching for what went wrong, it was that I installed many of them only on x64e directory, so the ones that have a newer version on dlcpacks didn't work (which makes sense).

However, still, comet2 and penumbra and a few others still do not work.

I have downloaded different replaces for both of them, and all the readme files say the same thing "install under mods/x64e/..." But when doing so, they don't work in the game.

Perhaps you guys know another location? Like inside of any dlcpacks?

I have the game almost vanilla for mods, so there shouldn't be any problem with the followings:

Natural Vision Evolved (brighter lights, low settings enb, performance and nothing else)
HeapAdjuster
PackAdjuster
ScriptHook V
ScriptHook .NET - 2 - 3
gameconfig for unlimited cars

Hope you have some solution to this.

PS: I do own Steam original copy of the game.