I had to look on reverb to get it right, the livewire classic bridge had a yellow band, and the classic neck had a blue band.
There was never a metal neck from what I recall, you just used a classic or left your passive neck pickup in place and added a resistor to the active one to get the values to work. Maybe they sold a pair of the classic neck with the metal bridge and called it the heavy metal set?
There’s not much information left on these, maybe someone from the company could tell you what that means. How do they sound?