Knockout Rally Acorn Centers

Thanks 73Swinger18. I've seen these and may end up buying them, but I am trying to see if anyone sells just the brushed finished "knockout part"? Some of mine are dented and pitted. I've looked online and cannot seem to find "new knockouts".

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Oh. I thought you might be asking about those, but wasn't aware that they were removable. I'll keep my eyes peeled.