I don't think I understand this at all. Why would you need a swivel and why would your winch line be twisting to require a swivel?
I have used winches nearly all of my life and don't remember encountering a situation where I thought that a swivel at the hook would be advantageous.
Also, welcome back N2IT. In reference to his comment, you have to make sure about buying components from crane rigging suppliers. Many of their items are for vertical "free" loads only and will fail if used in the typical winching scenarios.
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