To find the interior dimensions, you need to specify the *exact make and model* of the 15-passenger van (e.g., Ford Transit 15-passenger, Mercedes-Benz Sprinter 15-passenger, etc.). Then, you can:
* Check the manufacturer's website: The specifications section will usually list interior dimensions, including cargo space and passenger compartment measurements (headroom, legroom, width).
* Consult an owner's manual: If you have access to the manual for the specific van, it will contain these dimensions.
* Use online resources: Websites like Edmunds, Kelley Blue Book, or others that provide vehicle specifications may have the information you need.
Without knowing the specific van, I cannot provide you with accurate interior dimensions.