You have to download the whole HD Models (or HD Models Lite) mod, then just copy the files listed above (while keeping the file paths) to your gamedata folder.
The easiest way would probably just be to download the mod, drag its gamedata folder from its zip file somewhere convenient (like your desktop), then delete everything in the folder except the aforementioned files. You can then move the folder with just those files to your gamedata folder (or create it as a mod in Mod Organizer 2, which I'd recommend you look up and learn how to use if you want to get more into modding).
Noxilian
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