the reason i picked that car is its got a Simmilar bodyshape to a VN / VP Commodore.
i have tried to keep the car and textures around the era of 1991 / 1992 (as the game is based in that era) Some textures are a bit newer tho.
but yeah, im lazy, so i am going to quote my readme, post some images and a DL link.








Once you have Unpacked the Zip Archive, Open the folder of the State Police Car you want to use, then follow these instructions:
=========================================
ATTENTION!
THIS IS JUST A TEXTURE! GET THE MESH FROM: http://gta-worldmods.planet-multiplayer.de/phpkit/start/include.php?path=content/download.php&contentid=2141&catid=54&themeid=41
Installation:
Using IMGtool replace the Mesh (copcarsf.dff) from the original package (Link Above)
And in IMGtool replace the Texture (copcarsf.txd) from inside this package.
Rebuild archive, Done!
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Dont want to replace your CopcarSF?
then you can rename the copcarsf.dff and copcarsf.txd to either:
copcarla.dff & copcarla.txd (Las Santos)
or
copcarvg.dff & copcarvg.txd (Las Venturas)
and follow the Installation instructions above to replace desired cop car.
if you want it.... heres the link...

i myself have Vic = LA, NSW = SF, NT = LV
but ive left the option in for anyone to use whatever they want for whichever cop car they want.