For your information, service 178 do officially have 4 perm CAC
Nissans: TIB1248D, TIB1250X, TIB1251T and TIB1252R. Service 980
have 1 on S-Shift: TIB1254K.
Those other CAC Nissans including the CSS regos are spare buses
cameoing on services 178, 187 and 980 daily 
For AMK side, service 853 have 1 perm OAC Nissan: TIB377X. TIB34H,
TIB365E, TIB1256E and CSS189D are spare buses. So far these sapre
buses are seen cameoing on ALL AMK services before, including
service 67 too.