@Spitfire7 Download any of my Add-on Mod. pick the latest one. and once you have installed my Add on dlc. for example, leo2a7. put your vehicle files along with my vehicle files in the dlc. in vehicles.rpf. i think you know how to get there. anyways. after placing your files , just copy paste your vehicles.meta & handling.meta lines into my meta files. respectively. after this you can spawn your car by the vehicle file's name. Note: you must give vehicles files the same name as mentioned in vehicles.meta & handling.meta . i hope you understand my meaning. i tried.
@FoxtrotDelta and @Spitfire7 Sorry I joined the party late. I have read the entire thread found the vehicles.meta file which is located in Grand Theft Auto V\mods\update\update.rpf\common\data\levels\gta5
however, after adding these 3 lines