What was wrong with the old system?
Know your S.H.I.S, man.
External headset for straight 1.125" steerers: Upper EC34/28.6 Lower EC34/30
1.125" - 1.5" taper in a 44mm HT Upper ZS44/28.6 Lower EC44/40
Straight 1.125" in a 44mm HT Upper ZS44/28.6 Lower EC44/30 or ZS44/30 if you like your headset stealthy.
@Emyr started
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What was wrong with the old system?