Solaris

Hi and thank you for what looks like a great car pack. I can't wait to try it but im running into a problem when trying to spawn cars. (new to modding here): I install the package via OpenIV, launch game - no issues, but then trying to spawn vehicles using the trainer, I keep seeing the default GTA police vehicles spawning. I had previously installed a Firetruck mod from another user and it spawns fine but none of the police cars do. I even manually enter the spawn name (police5, police6, etc) and receive an error for the Police5,6,7 vehicles saying that the model is invalid (or not found). Any idea anyone? I have other mods installed both scripts and vehicle and they seem to work fine but police vehicles still remain GTA defaults. Any help is appreciated. Thank you