RCA sockets for 10mm holes?

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I have an aluminum case (from China) for my preamp that has a pre-drilled 10.8mm holes. The usual RCA sockets that I have for projects are for 8mm holes and even with the insulating washers, they are too lose. Any ideas where I can get RCA sockets for 10mm holes?
 
It is, ten mm is .393, and 3/8 is .375.
As long as it isn’t shorted to the case, and looking closer it does look like the stepped washer actually matches the dimension of the actual socket, which is 3/8”.
Sorry for the quick evaluation before...

I will be getting a set as well.
 
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