https://www.hwconfig.com/waterblock-finder
If your card is compatible, it'll be one of the options at the bottom of the page. [Already checked - there's an Eiswolf 2 for FTWs, but not for XC3s.]
There weren't many companies who dealt with gpu AIOs. It's just Alphacool keeping up with 'em now; NZXT and ID-Cooling both seem to have stopped at RTX 20.
This guy mods a Kraken G12 to fit a 3080 Ventus; Kraken G12 doesn't officially support RTX 30.
This video really nags at me, as there are no gpu hot spot, nor Vram thermals posted. There's more to these cards besides the core temperatures.
Though the power draw is very low, GDDR6X memory has high operating temperatures. It needs heatsinks and airflow for cooling; the Kraken G12...