Can you get any numbers off them? If so fleet guard have an online cross reference, more than certain they will be able to do them. I use them for all my filters once the warranty period has ran out on the newer machines.
If Mark’s link doesn’t get you anywhere, then try inlinefilters.co.uk , sure it’s .co.uk...might be .com?, anyway, they are a good resource for cross referencing filter numbers. Their helpline is very good too, but all orderes must be placed online. I use them for 80% of our filters.
If you can get a make/number off it try Smiths auto parts in Nantwich - they recently matched a Donaldson filter off an American PTO chipper that I had cross referenced and found various matches online priced around £30. They matched it to a Bosch filter for a Porsche for less than 15 quid, in next day. Good bunch in there!