Kanzaki KM4A

[kilmaine]

I have recently had a catastrophic failure of the above Yanmar gearbox following an engine over rev due to a seized injection rack. The moral of the story is if you are starting a diesel after many years of non use remove the air filter and have a suitable implement handy to block the air intake and shut down the engine!
I need to find a replacement gearbox of 1.47 ratio or failing that another KM4A that I can use to repair mine as the casing is split amongst other breakages.
Any suggestions welcome. Based in Surrey, UK.