may I suggest Ebay or Helen Howes
http://www.helenhowes-sewingmachines.co.uk/
She even has a special section for the WW9 here
http://www.helenhowes-sewingmachines.co.uk/ww9.html
If you can post a couple of photos we can do a better job of helping you to figure out what you need and where to get it.