OK, from memory:
Executive/Equipe/Olympic/50th Ann: immobiliser, deadlocking
Acclaim: as Executive, plus alarm
Berlina: as Acclaim, plus Remote approach lighting(S2)
S: as Executive (not sure whether has an alarm)
SS: As Acclaim (not sure whether it has alarm)
Calais: Deadlocking, immobiliser, alarm, remote approach lighting(S2)
That's just from memory, I'll look up later for sure and edit if i need to fix anything up. im sure VT owners or anyone can correct anything. A good site with VT specs is
http://www.users.on.net/~nweber/commodore/vt/index.html