This outfit do a lot of spares. If you can't see what you need, why not email them? Sending a photo might help too.
https://www.espares.co.uk/search/mo1726641/fridges-and-freezers/john-lewis/jlaffs2009
You could also try John Lewis customer service and ask if their products are properly supported with spares.
Dr hiiyfc
June 2020