So I installed Ripple’s ELS LSPD vehicle mod pack and when I spawn vehicles in, the only vehicles that spawn correctly are the ones not labeled Police[#]. For example, all the vehicles that replace the sheriff, fbi, or pranger vehicles spawn in properly but any police vehicle like police2 police3, etc do not. I have them all installed in the same patch day folder and have tried patch day 26, 1, 3, 17, and 20. All of them have the same result. I also installed the vehicles.meta that came with the mod to replace the vanilla vehicles.meta.

Ok just to clarify, I guess this isn’t technically considered an add-on since the files replace police[#] files

Try to use Patch 24 or 25. And make sure the vehicle's names are Police 2 and Police 3, if you want to replace the original models.