To get the rear shoulder room for a 2001 BMW 5-Series, I recommend you:
* Consult the owner's manual: This should have the detailed dimensions of the vehicle.
* Check online resources: Websites like Edmunds, Kelley Blue Book, or Car and Driver often have detailed specifications, including rear shoulder room.
* Visit a BMW dealership: They can provide you with the exact information.
Remember, rear shoulder room can vary slightly depending on the specific trim level and options chosen for the vehicle.