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Dear, no need to match, this kind of accessories damage can only be to replace all the panels and handles (the two are combined together for sale), if you want to separate accessories, you can only find someone you know, the remaining accessories when replacing the panel.
This spring should be the button spring to control the indoor to prevent the outdoor unlocking. >>>More
Find someone who specializes in lockpicking, or your local locksmith's association, if you have one. >>>More
It should be a matter of the lock cylinder. If you don't want to change the door, you can try adding some pencil ends to the keyhole, and if that doesn't work, change the lock cylinder. This will cost a lot less than changing the door.
If you don't know which direction, you can take a look at your door lock for reference, and then use needle-nose pliers or tweezers and other tools to pull out the key.
If you lock the handle, there is a screw parallel to the lock cylinder, and the lock cylinder comes out when the screw is twisted off. There are generally five kinds of lock cylinders, A B super B super C super C level and now there are imported D class lock cylinders, but there are very few.