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Set the main page for custom post type

I have a custom page type called "car", the links are site.com/car, site.com/car/audi, site.com/car/bmw etc

When I access site.com/car, WordPress picks up archive.php and shows the content.

I would like site.com/car to use the specific page I pick (I would pick site.com/car/index and the url should remain site.com/car though). I want to mimic the same behavior like you can set the frontpage for WordPress site.

My car page list would look like this:

Is that possible to achieve?

Thanks