Changing the vehicles, peds and weapons used in missions and activities?

Basically I'm trying to change the vehicles driven by the enemies and my allies in Heli Assault, change the NPCs used in Escort, Snatch, etc, and change a few of the enemies and enemy vehicles in some missions.
I've searched in the files like m17.lua for missions and _a_es_ne_03.xtbl for activities, but either I can't find anything relating to what I'm looking for, or the file is referring to "groups" instead of individual NPCs and I've searched but I can't find any file that would have these groups for me to edit them.
Any help would be appreciated.
 
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