The bottom taper of the head tube looks too small to be 56mm, you do get 44mm external cup headsets.
That looks to be a standard 1 1/8 external cup headset (EC34) (Hope Type 1 cup) for the top then a 44mm external cup headset (EC44) (Hope H cup) for the bottom giving you the 1.5 lower race.
I do not think these come as a standard headset from any manufacturer so some kind of pick and mix is going to be your best route.
If the upper section of the headset is OK you do not need to replace it to match the lower cup they are 2 independent units and can be treated as such.