[COLKURTZ]

Das sagt das Technical Manual dazu:

Carbon Frame Headset FSA No.85-1 0mm Offset FSA No.85-1 0mm Offset Headset, complete.
See Headset chart for information
Carbon Frame Headset Cup Set FSA No.85-1 5mm Offset FSA No.85-1 5mm Offset cups only. See
Headset chart for information

Alloy Frame Headset FSA ZS56|66 0mm Offset FSA|RMB ZS56|66 0mm Offset Headset,
complete. See Headset chart for information
Alloy Frame Headset Cup Set FSA ZS56|66 5mm Offset FSA|RMB ZS56|66 5mm Offset cups only. See
Headset chart for information

und das, wenn man zB in die Specs des C70 schaut, also Carbon:
FSA Orbit NO.85 Reach Adjust| 0mm Cups Installed | +/- 5mm Cups Included | Durable Sealed Stainless 36°x45° Bearings | 30.2mm x 41mm x 7.1mm Upper | 40mm x 51.8mm x 7.5mm Lower | 1.5" Crown Race

...also, Carbon betreffend, leider keine Angabe ala IS, ZS in der Größe XY usw.
...sowie beim Hersteller selbst, FSA, ist kein Headset No. 85 zu finden