Excellent. Thanks for the clarification, Bill.
Looks like ATE only makes a 20.6 unit at present (
https://www.pelicanparts.com/More_Info/357611019.htm?pn=357-611-019-INT&bc=c&SVSVSI=4236).
The 22.2 on offer is made by TRW (
https://www.pelicanparts.com/More_Info/357611019B.htm?pn=357-611-019-B-M80&bc=c&SVSVSI=4236).
In your opinion, would a larger m/c on stock non-S calipers be worthwhile?