If I’m not mistaken 44mm external headset’s are generally for tapered forks (EC44/40), for 1-1/8” forks you use a ZS44/30 which doesn’t have the external cup as it isn’t needed.
If you want the external cup and to use a straight steerer you’ll need to use the EC44/40 cup - usually designated for tapered steerers - and a 1-1/8” to 1.5” crown race adapter (such as the Hope HS136)
If I’m not mistaken 44mm external headset’s are generally for tapered forks (EC44/40), for 1-1/8” forks you use a ZS44/30 which doesn’t have the external cup as it isn’t needed.
If you want the external cup and to use a straight steerer you’ll need to use the EC44/40 cup - usually designated for tapered steerers - and a 1-1/8” to 1.5” crown race adapter (such as the Hope HS136)