@bmSgtav
Just in case you haven't found it:

...\mods\update\x64\dlcpacks\patchday19ng\dlc.rpf\x64\levels\gta5\vehicles.rpf\penumbra.yft

If you hit Ctrl+F3 in OpenIV you can search for stuff by name & find it quickly.
Much better than using the search/filter bar (unless of course you hit the blue 'search for "penumbra" in all archives' link after doing so (it opens same search box))