I'd like to add some firsthand info on this.
My merida big 7 carbon edition (2014) was listed as having this headset.
The headset is a ZS40/28,6 - ZS55/40 but Merida (FAS) call it big conoid. Conoid just mean "approximately conical shape" and is a rather poor spec.
I used
https://blue.canecreek.com/headset-fit-finder to get the headset specs but it missed on the lower headset spec (said ZS56/40 not ZS55/40, thankfully the bearing I had on hand fit into the original lower cup and got on).
In conclusion, use caliper to verify the dimensions you need on the bearings and so on, and be prepared for the eventuality that the components may disintegrate on opening the headset if it is in poor condition.