The previous answer is wrong and right at the same time. The specified fittings (screw-on nozzle) do fit, but this has nothing to do with the hose diameter. It only has to be the same as for the screw-on nozzles so that everything fits afterwards.

The internal threads on the water block on the card are the important part - here you need G-1/4 threads (regardless of the hose diameter). G-threads are standardised according to ISO, which means: if it says G-1/4, the grommets will definitely fit on the block.

13mm fittings fit on the card: Alphacool 13mm icicle G1/4 Sixpack

So it needs 13/10mm tubing diameter: Alphacool Ice Tube 13/10mm - Set of 4 (0.80m, PETG)