I reckon you might have to quote to replace the lot. That should test how really keen he is on them matching.
You might find a specialist door furniture dealer like ironmongery direct might just recognise them if you email them a better photo.
I'm not even sure what the proper name for those gadgets are they use on double doors. If you put that phrase into Google images you might just spot them. "door closer" is just too broad a term to get useful results.
Bob
PS if you send "stu" a PM, he is a man of doors and might just be able to help
http://www.thewoodhaven2.co.uk/memberli ... ofile&u=84