First suggestion is to unplug all of the generators, then start plugging them in one at a time, while watching the Devices and Printers page of Control Panel.
Once the first shows up correct, plug in the second, wait for it, and repeat until all are connected.
Remember, though, that Windows assigns numbers at will, so they may be all over the place - and change whenever a reboot is needed.
Don't get too hung up on it - I use Post-It Notes to keep track of which is where and just move them around as needed.
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