Huzzah! That fixed it for the RX-7. Thank you! Tried replicating the same layout reference for the Fairlady and running into issues.. I guess I may need to stack layouts for them to work in one DLC?

I have a solid method of installing addon cars. I've installed 22 in one DLC with no issues. Throughout my installations I've had issues with only 2 cars. Those 2 cars had right side driver seats. The Mazda RX-7 and Nissan Fairlady Z. When I spawn the car, I don't spawn in it. Once I try to get in the car, the game crashes.

I'm assuming there's some error related to the cars not having left side driver seats. I've tried searching the forums, but I must be searching the wrong terms or something. Anyone able to help with this?

Got it, that makes sense. Thank you for that! I'm starting to run into cars that don't have properly working brake lights, or reverse lights. Is that something that can be tweaked in the data files? Or is that more hard coded to the model?

In regards to modkits, is 0_default_modkit an entry recognized by the game? Like it's a modkit that is a part of the game? I started naming my own mod kits. For example, "255_modkit". Would I be better to use the default modkit entry, but then just change the value IDs in carcols?

@meimeiriver I started a system where I define each of my modkits with whichever ID I will be referencing. For example, with my first car, I started with 255, and am working backwards. Issue I'm starting to run into is for some reason, I can't respray some cars, but others work fine. Not sure if this is a modkit thing?

@ReNNie ah got it. So to me, that seems like quite a few lines of unnecessary code. Unless you reallllly want to be able to spawn your car with random colors... I'm thinking I may just trim all my add-ons down to one entry.

@ReNNie some mods have a ton of these <indices content="char_array"> definitions while some don't have many. Are these required?

@Willief23 what if the car does have tuning parts, but I don't really care to use them. Could I just not copy over? Just want to make sure I'm not upsetting some balance in the code somewhere. Whenever I get crashes I can never really tell why they happen.

@ReNNie could addon cars use the same modkit and light kit? Essentially just having one <kits> and one <lights> for all cars?

I'm running into this exact same issue.
Sadly I don't have an answer yet, but I'm exploring. Would LOVE to find a solution!!

Do you have any mods that effect the master carcols files? Like any mods that are used to enhance or make emergency lights brighter? I'm wondering if that maybe a culprit.

I just have car addons, weapon texture and sounds, rippler's realism, NVR + ENV, VisualV, and the brighter emergency lights addon from the NVR mod.