The plastic component surrounding the interior door release handle, locking the leather door panel in place. One of mine went missing, so that's my story and I'm sticking to it. :) If you need these, you know how they work. I've updated the file to include a self-contained support for the raised snap. No need to build a raft for a tiny raised bit:) I found my missing part, so I haven't tried this out in real life. If the dimensions are off, please make a new "Thing" or let me know and I'll change this one.