I'm planning on installing some ZW emgs in my ltd ec 331 because the stock pickups aren't giving me a great high output metal tone but it says this set of emgs comes with 4 long shaft pots (obviously because zakk wylde uses les Paul's) will these fit in my ltd which only has 3 pots?
The ZW set is exactly the same as the 81/85 set but with the long shaft pots. So just buy the right set instead if you know your guitar uses short shaft.

The 81/85 set comes with instructions for wiring with three pots, no issue there.