I don't know the figures but I would suspect the vast majority of new cars are bought off the lot, they are existing built cars, not ordered in advance. Why, because those are the ones that go on sale and that you can make the cheapest deals on. I also don't think the majority of new car buyers know anything about the mechanicals of the car they are buying. After all part of the draw of buying new is that if it breaks you don't have to pay to fix it or fix it yourself, you have this nice warranty that does that. So why would a new car buyer care about ordering a prone-to-break item like an automatic tampax remover when he's going to buy an extended warranty anyway, and sell the vehicle when that runs out? He isn't going to know what's in the vehicle and he is going to care less.
True story - a couple weeks ago I called someone about buying a used van they were selling. I asked them over the phone "does it have ABS brakes, yes or no" the answer was no. I go look at this van that they had owned for years, sure enough yes it has ABS brakes. Now someone explain to me how can somebody own a car for years and not know if it has ABS brakes or not? Don't you think the little warning light that lights up when you start the car labeled ABS would give it away?
This is the typical level of knowledge of a typical car owner, and you think they all want to special-order the options in the cars? Well maybe the cupholders.
Ted