We are due to pick up our 17.56.1 OB at the weekend, we were told that they were not available. Irrelevant really as I have had these light/fans in our Swan for the last 5 years.I had to have them shipped across from USA though as I could not source them here. They cost around $100 inc postage for a pair , but this was 5 years ago! I have seen them here a few years ago but was told that you had to buy the camper van to receive them!!