Help me locate scrapped Derwent engine

Does anyone know where there are scrapped Derwent engines. Preferably Mk9s or Mk8s that have had the upgrade to Mk9.

What about spare parts? Does anyone have a source for parts?

In particular I am looking for the Mk9 (I believe) balance pipes. These were fitted to Mk8s and Mk9s as part of an upgrade in 1952.