How to find vehicle packages - can you help me?

I am ready to send out emails as per the suggestions here…

But the car manufacturer’s sites never seem to just list options and packages - even when building out a new car.

And TrueCar’s options and packages never seem to match up with actual inventory.

Any ideas on how to find out each car’s options and packages in a consistent way?

If you’re looking at specific cars on dealer’s sites, the easiest way I’ve found is to look at the sticker PDF which is usually attached. At least that’s what I’ve been doing on Infiniti dealer sites.

I find Edmunds to be closest to the actual packages/options, so I build my car there as close to dealer’s in stock car as possible.