FWIW, here are the relevant saves and AC for the CR 19-22 FCII greater aspects:
Fierna:
Armor Class: 41 (+6 Dex, +14 natural, +6 armor, +5 deflection), touch 21, flat-footed 35; Dodge, Mobility
Saves: Fort +26, Ref +27, Will +27
Bel:
Armor Class: 39 (-1 size, +2 Dex, +20 natural, +4 armor, +4 deflection), touch 15, flat-footed 37
Saves: Fort +23, Ref +15, Will +21
Belial:
Armor Class: 43 (+6 Dex, +22 natural, +2 armor, +3 deflection), touch 19, flat-footed 37; Dodge, Mobility
Saves: Fort +24, Ref +25, Will +25
Dispater:
Armor Class: 44 (+2 Dex, +25 natural, +7 shield), touch 12, flat-footed 42
Saves: Fort +28, Ref +20, Will +22
Levistus:
Armor Class: 42 (+7 Dex, +15 natural, +5 armor, +5 deflection), touch 22, flat-footed 35; Dodge, Mobility, elaborate parry
Saves: Fort +23, Ref +21, Will +25; evasion
Mammon:
Armor Class: 41 (-2 size, +2 Dex, +22 natural, +4 armor, +5 deflection), touch 15, flat-footed 39; Dodge, Mobility
Saves: Fort +27, Ref +20, Will +25
Glasya:
Armor Class: 46 (-1 size, +12 Dex, +20 natural, +5 deflection), touch 27, flat-footed 34; Dodge
Saves: Fort +28, Ref +32, Will +29 (+33 against mind-affecting spells and abilities)