New Key for SSHD

Hello, I build up 5 Firewalls, as they have the same konfiguration, Ibuild up one and did 4 clones with the Raid. Work perfekt but, now I have five times the same Key for the SSHD which I use to manage this boxes remote. I'm sorry but I can't find how to create a new key for the Host and where to put it into. Thanks for all hints Peter -- Gravity never sleeps :-)