You can make a power cable, the pinout is non-standard, but people have made them and posted schematics online. They do sell them on ebay but it’s a gamble if you get a good or bad one.
Does your XD have the risers with power taps on them? Riser 1 and 2 (or 2 and 3) should have 8 pin power taps that will supply power to your 3060.
Make sure you have dual 1100w power supplies, and the server in a room you don’t use, as the fans are likely to ramp up since the card is likely not a blower style card and the servers fans will work harder to keep it cool.
I’m sure someone else will come along that has more experience than me, and give you some more advice