Is there such thing as SMRT 103? I think it should be TIBS 103,
a PAC service because I also saw NAC buses plying on Svc 103, my
guess is Nissan U31SCN and Hino HT238K. 
I think there are no NAC buses since all Nissan U31SCN and Hino
HT238K buses which are NAC buses were phased out in 2001, so the
SMRT Buses fleet consists of Air-Con buses & CAC buses
now.
The NAC MB O405 (Hispano) and NAC Scania N113CRL (ELBO) were
converted into air-con buses somewhere in 2000. 
