Can you identify this part?

It's one piece in a set of three from an early Precision Power car amplifier. This one has 2 sockets, The next one has 4 sockets and lastly the largest one has 5 sockets. I'm guessing the pins would be about 5mm in diameter and the wire input size is up to 6ga or 8ga I'm guessing.
I'm ultimately looking for a part number if possible.
Thanks for looking!
 

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  • Precision Power 6ga 8ga plug.png
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Yes, those eBay prices are scary, 5 to 10 times you would expect to pay functionally equivalent (but not compatible) mains rated part from quality brand. My quess is that those connectors are not in current production any more so it is sellers market.