I'm trying to get a few new police cars added in to my game (just replacing stock cars) but every time I do I have an issue. When I replace the visual files it messes up the lights on other emergency vehicles (ie one time the lights on the ambulance turned blue, another time the lightbar just stopped working) but if you don't add those the added cars don't look as good. Can anyway explain (simply, I'm still pretty new to this) how to correct this, and/or a better way to do it. Also, any suggestions for easy to add cars (especially unmarked) that don't have any issues like this would be appreciated. Thanks :)

:)