I have just recieved a full OBC from the states and will fit it tomorrow I have looked at the fitting and will need to cut the back of the mounting hole but I have pluged it in and it works, not bad for 29$AU from jackgor on ebay he had a few of these as well as switches from e34's not bad delivery time for budget shiping sold as is untested but all works and has many other little bits from other models
Well I have installed the new OBC and all seems to work ok but i will have to check if the settings are right does anyone know what country number is right for Australia plus I think it came out of a 535 so I am not sure what I need to change mine is a 525. I think the tank size is the same and I have looked at what I could find on the forums so I will just keep poking at it till I am happy