Board mounted RCA socket assemblies (if that is what they are) are available on places such as Mauser etc
Here is a link to just one. As I cannot 'see the type of connection that it requires you'll need to open the sub up and ascertain the exact type of mounting connection that you require.
Here is the main page that it came from. If it is not the right type scroll through to find the one you want. There are over 600 RCA variations to select from. it should be in one of those.
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