Newage dropbox gears

[Rich162]

Hello, I'm rebuilding a dumper and I have been doing some repairs in the gearbox but unfortunately the dropbox has a damaged gear it looks like metal fatigue. The gearbox is a 40m4x the actual box has been straightforward to get parts for but now I am stuck! Would anyone have a parts drop box kicking about ? Or know of where to try and source a gear. The 2 gears are the same size and have 34 teeth.