I was being a bit light-hearted when I started this, didn't want to be contentious.
But yes, obviously there are some areas of a car that are "bespoke" (using the word as a design rather than a product such as a bridge). Obviously the body shell and panels and light-enclosures are "bespoke", but, even the actual process for large-scale production of the "bespoke" parts is also "off-the-shelf". All car manufacturers have a close relationship with the companies that produce the "bespoke" parts, but then there are loads of "non-bespoke" or "off-the-shelf" designs and parts.
To my way of thinking, It is the Honda petrol engines (and gearboxes?) that are true Honda, they share little (if anything) in common with other marques. Those are not "off-the-shelf", they are truly "bespoke".
But the problem is that many people who buy cars, whatever the marque and model, think that every single part of their car was designed in-house by some R&D guru, and that includes the ICE, NAVI, aircon, braking system, etc, etc.