Try fleabay particularly schillachi61 Stefan is a really good bloke. You may also find some stuff via Gleave & Co or Cousins in the UK (can't speak for other countries) they don't always list all the parts on their sites so e-mail them. If you need part numbers use J, Borell website here: http://cgi.julesborel.com although they don't list a great deal for this model. You may find a generic gasket to fit but if they are in good shape don't change them, just gently clean and use a little silicone grease on reassembly and don't get the watch wet. As for the crystal gasket take it apart to find out if it has one.