The bobbin cover or slide plate does not have anything attached to it. There are groves on the back to slide over a spring that is attached to the machine in a grove at the left end of the bobbin compartment.
Sew-Classic has the cover, the spring and screw if you need them.
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These slide plates slide onto the spring from the RIGHT to the LEFT. Once on they will not slide off, you have to push them to the right as you lift the edge to clear the needle plate and feed dogs. Remove the needle first.
The latches can be had at most any hardware store, but they might not be the same size as the originals.
Joe