The description hasn't been updated for a while, but the good news here is that if it's not included, you can get a kit for free directly from Arctic with proof of purchase of the cooler and matching CPU. So (apart from the few days' wait) it doesn't matter if it's included or if you order it from Arctic for free.

Radiator sizes N/A front, 120/140/240/280/360mm top, 120mm rear, 120/240/360mm right Source: https://preisvergleich.pcgameshardware.de/nzxt-h9-flow-black-cm-h91fb-01-a2876969.html

The best way to place an order is to contact our customer service department directly at https://helpcenter.digitec.ch/hc/de/requests/new. Then your request can be checked individually. However, we have been informed that you should have received the delivery by now.

Also lt.Corsair Seite sollte eine 420er Kühlung samt Radiator passen: https://www.corsair.com/de/de/p/pc-cases/cc-9011218-ww/7000d-airflow-full-tower-atx-pc-case-black-cc-9011218-ww

yes it is. cools my am5 7900x perfectly, there's nothing better and it's super quiet.

Yes, here is the statement from Arctic (Arctic will send you the kit in case it is missing): "At the end of 2022, AMD released the AM5 socket, the successor to the popular AM4 platform. Since all mechanical dimensions remain identical, we also guarantee compatibility with our ARCTIC coolers on AMD's new processors. In addition, all coolers shipped by ARCTIC are already compatible with Intel's Alder Lake and Raptor Lake LGA1700 processors ex works. Coolers purchased from resellers may still have been delivered without the corresponding accessories. In this case, please contact our customer support."

Currently we still have one piece in stock and are in the process of clarifying the next delivery.

The Arctic Liquid Freezer II-420 RGB Black did not come with an LGA 1700 mount kit included in the box.

No it doesn't! this one comes with LGA 1700 : be quiet! Silent Loop 2 very good product

According to the manufacturer's page, a mounting kit for the LGA 1700 should be included

Unfortunately the brand does not indicate this information, I'm sorry. ):

Answer to my own question. The cooler fits in the front with cages. It's just that the tubes don't go towards the bottom. They are too short