don't forget the Mk.13 is an AMERICAN weapon, so should ONLY be available on Allied aircraft.
there should be a German Trop available for use ETO/MTO Axis use (W_Germany attactment type) for heinkels and sparrowhawks.
the IJN has it's own, too Type something-or-other for the Kates, Jills, Betty and Nell
edit:
wepons folder is called "German Torpedo"
Type91_Torpedo for the japanese
also, if using SF2NA as the mods folder base, you may need to add "NAVAL_STRIKE" or "CRUISE_MISSILE" to the mission tasking. Of course, this means the torps have to modified to BE cruise missles, which opens up, yet another, can of worms. and all the bs that creates...
*note- naval_strike can be used for standard dumb bombs attack profile