Mustang Boards - anti theft module

anyone know about the wiring in the trunk for the factory alarms? i was thinking they used the same harness on all 94-98 sn95 models and that is why our v6 cars are already wired for fog lights. so i just got a keyless fob off ebay and programed it and lock unlock work fine using it. so i figured there in the trunk is the bracket for the anti theft module and all i would have to do is pull a module off an sn95 in the junkyard and plug it up and i will have alarm. i don't see the extra plugs that were plugged into the one i picked up yesterday. are they comming off the actual harness or are they tucked back behind the plate where the module sits. or were some mustangs not wired for it at all? i have the theft spot on my gauge but i have never seen it actually light up.