This is the one you want.
http://www.subsim.com/radioroom/down...do=file&id=962
Also affects shell holes.
Actually I lied. Those last two aren't from shells. They're from the torpedo fragments ripping up through the opposite side of the ship. Probably from this mod:
http://www.subsim.com/radioroom/down...o=file&id=1420
Also, you really need one of the supermods and SH3 Commander. The game has gone so far beyond stock you have no idea what you're missing.