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@neogeo39 They were put in by Lundy (the original author of the car and textures) and I was told not to take them out. I don't know their purpose either.
@lexus_ekna24 I uploaded it to this link: https://imgur.com/a/QiLu7QO

@ModMyGame Well, I'd recommend checking all the files again for typos or other mistakes, as well as making sure that you did everything correctly (fore example: if a car doesn't have for example tuning parts,you don't need to add the es that are related to that)
If you double-checked everythingand it still doesn't work, then see if you don't have too many addons installed and if you do, you can either remove some, or download a gameconfig that allows to add more addons (be careful, even with the right gameconfig, too many addons can cause the game to crash)

If none of these work, then I'm afraid, my addon base might be outdated. I made this thing a while ago and I haven't played GTA V for at least a year now so there might be some patch or something that made this method unusable. Sorry 'bout that and sorry for the late answer, I rarely visit gtat5-mods nowadays.

@Barra220 Hi, sorry for the late response, I read all your comments and well uhm... You should be able to install more than just 4 addon vehicles (before I uninstalled my GTA V I had like 250 add-on vehicles and more than half of them are made with my method)
altough I needed some modification to do this, you need to find a new gameconfig.xml file, there are tons of it on this website, they modify the game to enable more add-ons, (tho the game still shoudn't crash from 4 add-ons)
for the tuning parts: this is a problem that I wasnt able to solve (altho I never really tried cuz I mostly installed tank and airplane mods which didnt need like new tires or somethin) but as far as I know you can't install tuning parts cuz for example when replacing you replace the base ofd the car and its tuning parts are at a separated file and the game links that model to those parts, if you add it separately as an add-on you have to add the tuning parts to the add-on folder too (find these files in the game somewhere and add them like you'd add any other downloaded tuning part, using my method) and then you should be able to put these on.
for the last comment, I have no idea sorry
My primary thought for all your problems is that rockstar made some huge changes with the latest patches and my add-on base is kinda outdated (I'm not planning to update it cuz I kinda stopped any kind modding for now) (tho thist doesnt explain why you still can install 4 add-ons but no more)
I hope I could help, have a nice day :)

@Barra220 does the car have tuning parts? if it does and you are sure that you installed them correctly then I don't know sorry, maybe check the files again for mistakes and check again if you put everything to the correct place and wrote the correct lines

"Rorschach's Journal: October 12th, 1985; Tonight, a comedian died in New York"

@InYourFace then I really don't know, no problem like this ever happened to me

@InYourFace seems like you messed up something in the vanilla car's files, I don't really know to do because in normal conditions this shouldn't happen
@Murcocio check the files for spelling mistakes or lines where you forgot to rename

@InYourFace try checking all the files again for spelling mistakes, but as I'm checking the original mod it says the lowrider dlc is needed, so if you don't have the original copy of the game and don't have this dlc then that could be the problem

Deus Vult!

@raburs Hi, I will see ehat can I do but I just reinstalled my computer so I have to install GTA V before but I'll look after it, but the purpose of this mod is that you can do it yourself too, yu just have to extract the vehicles from the rde folders and find out which vehicle they replace and then using the mod convert them into addons ;)