Just a thought, putting the wheels on the car then the tires doesn’t make a lot of sense. All car production lines will assemble the wheels and tires BEFORE they are put on the car.
This would be a good candidate for separate assembly lines that feed into the main production line, make the wheels, make the tires, assemble the wheels with the tires, etc. Then those completed assemblies would feed to the Fit Wheels slot, no need for the Fit Tires slot.
Door Panels are another, you would assemble the door panel with the windows and then fit the doors.
Just a thought. Keep up the great work.