I can't imagine this even exists. I've seen standard molex to sata power adapters, but if all those are used I suggest getting a new power supply if it's a few years old anyway.
This is the only way I can see it being done, splitting the molex, and then converting one of the connections.
I did exactly like this in an HP Slim Desktop and it was the best way. Was a bit tight fitting all that extra wire and plugs in but it did fit. And if you are good with a soldering iron, you can customize them to be whatever size you need if the extra wire is a problem.
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