https://imgur.com/6ji9z5k
This is on a Gigabyte Z282-Z91 rack server.
These are the power connectors for the GPU but I have never seen these before and can't find them anywhere.
Look the same type that you get on PSU's for modern PCIe GPU's. They tend to just be labelled as an 8-pin 12V GPU connector (there are also 6-pin versions).
https://graphicscardhub.com/graphics-card-pcie-power-connectors/
Good picture from there:
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But check those rounded corners, the top left on there is square, is the bottom right on yours is rounded, they're not exactly the same but probably named similar. Makes me think there's a specific rack PSU for that with the proper corners for it...?
Looks to be the R282-Z91
https://www.gigabyte.com/Rack-Server/R282-Z91-rev-100
The manual just lists them as "4 2 x 4 Pin P12V GPU Power Connector", and no optional part numbers listed anywhere on Gigabyte's site, so as above I'd be contacting Gigabyte, unless @GIGA-Man can help