FT: needle beam targets

Do you have to specify the exact weapon when firing at a weapon
type with needle beams?  For example, this "behemoth" we are
plotting to kill has 2 or 3 class-5 beams with different arcs.	Do
you have to specify which class-5 by its arcs or can you say 
"any class-5 beam" and the target's player gets to choose?
Or can both be used (if I specify the arcs it has to be that weapon
or if I give a class he can choose any one of them)?

Btw, it's a 1000 mass Aquarian (sp?).  The best we've done so far
is needle beam'd its drives so it FTL'd away.  We want to
actually destroy it; which means we need to needle beam its FTL
drive, also.

Glen