I got all four in the car, the 19's in the back, bagged and protected with towels and the 18's in the passeneger seat bagged and wrapped in towels. There is no way they will fit in boxes. My wife had to work the day I had my appoinment to get them mounted so I had to be creative. The other alternative is to drop them off two at a time and pick up your old wheels the same way. I got everything back home with no damage to anything, you just gotta be very, very careful. I doubt you could do this in a roadster, just the coupe.
Pat