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MrLocksmith really is a Locksmith. LOL
Post a picture of what you need. I have a bucket of door hardware I can dig through. Some of it is Schlage, some is Westlock.
Sent this to Jim, I'll let you know if he has one.
Why not buy a new set and have it keyed?
I need more information to help you. There is a lock that uses that spring but is it more common to see it on a French door. Can you do me a favor and take a photo of the latch.