Don't trust Tesla with courtesy car as they will send you a message at the 11th hour saying they don't have a spare car. Without consulting with you, they will push the appointment by another month. It happened to me many times hence mentioning it. May be they did this on purpose with me as cost of repairs was theirs due to issues detected post delivery.
And did they not give cost of replacing the parts as an option? If the cost is going to be similar, its worth waiting for parts to arrive as it will be back to original condition. Just a thought.