There is no such information coming from BFBC2 servers. According to DICE documentation "BFBC2 PC Remote Administration Protocol.pdf" (R32), player.onKill events do not hold the hit location information.
The info which comes the closest is a flag indicating if the kill was made by headshot or other.
i have set it to count Headshot, and torso, and made it count to 20, but somtimes it says that a player has 20 kills even tho he only got 11-16, do you know why?