I recently bought some used cold room panels from a very nice man who has collected over the years lots of new and used bits and pieces for cold rooms and associated equipment.
These include different types of handles and hinges.
If you do need a hard to get spare or part of a hinge has broken and you don't want to replace all of it then it is worth seeing if he can help you out.
He is happy to try to help out so PM me for his details.
I'm not making anything out of it and he will charge very little plus postage and isn't running it as a business as such, so hopefully I haven't breached any forum rules. If I have I'm sure someone will let me know!