You should give Thor Service a call for the part number. I had a 2014 Palazzo before and the same latch kept breaking which the dealer replaced. When I was at the factory for service they also replaced it and discovered the reason for it breaking was when the door was being slid open it was going to far thus the second door was breaking the latch. There were no stoppers at the bottom track from preventing the door from being opened too far.
2018 Four Winds 31Y