190 fleet was almost 100% B57s and then Mk IIs. The LAs only
appeared from 1992 IIRC.
LA as in Type L or Type R bodied or is by DM???
2)
400 - MB OF1417s, B57s (primary), CRBs, Leyland Victory, MB O405s,
KUB
401 - Albion Viking, Volvo B57s, MB OF1413s, CRBs, MB O405s Mk2,
Mk3, Mk4, KUB
402 had variants
402 - Bedok to SAFRA Country Club uses MB O405 (DM)
402 - Bedok to S'pore Expo uses Mk3s.
402 - Marina South Pier to Shenton Way uses MB O405.
403 - Uses Nissan Civilian buses before switching over to B57s,
CRBs, Mk2, Mk3, Mk4, KUB
404 - Uses Albion Viking, MB OF1413, LP1113
405 had variants
405 - Jurong Int to Jurong Bird Park uses the MB OF1413, LP1113,
OF1113.
405 - Boon Lay to Choa Chu Kang Rd uses the MB O405s all along
before Mk4s/KUBs. Air Con Service.
406 - Uses Albion Viking, MB OF1413, LP1113
450 - Uses Albion Viking, MB OF1413, LP1113
It is noticed that Service 450 was handed over to Scheme B
operators and PH/PZ buses began to appear on Service 450. This
service is still around although AM shuttle buses are
available from Boon Lay MRT station.
Service 450 terminates outside the New Pasir Laba Camp
Entrance.
Nostalgic... 
What was the route for 404??? It starts from the old Jurong
Interchange but go where???