This is an engineering question related to chassis differences between trim levels on any single model year. I was told a third row could not be added if it didn’t come with one. Just from a production perspective why wouldn’t the chassis be the same on all trims/option levels and some holes are used and some are not? This is the same idea as me having no heated seats so those places in the middle console are just covers. I’ve seen the seats for sale on eBay but I’m not seeing them at the moment.

I’m not interested in drilling holes and such and plastic trim piece differences aside, why wouldn’t the factory mounting holes for a third row be in the chassis? I also am aware the the current rear seats may not fold like the seats that would be in a unit that shipped with third seats. Again, chassis related question.