Other location is: mods x64a rpfdatacarcolsymt the other 3 (sheriff2, fbi2 & police2) use '0_default_modkit' (the default for cars with no modkit parts) rather than carcol settings that have their name. Gta v carcolsymt location. When editing carcolsymt will be possible you should be able to add kuruma there i found a file carcolsmeta in gta 5updatex64dlcpacksmpheistdlcrpfcommondata rockstar put all heist files in it's own separate file in the mpheist update location in that folder carcols is editable :d.
gta v carcols.ymt location
Variationdata modelname vehicle model name colors indices colors ids, called from carcolsymt liveries sets whether or not