I have a Bav 42 of 2005 vintage. I have had to replace the locks in both heads. I got them from http://www.southcomarine.com in Sweden. They are branded Mobella McCoy and are part No MA-R9342. They were not cheap at €55 each, just for the lock, but they work. You can unscrew the handle with a small Torex screwdriver to release the lock from the door. Hope this helps.