Ravagers can switch out any of their lances with disintigrators on a one for one basis.
In my game earlier tonight, I realized that Dark Eldar need to be far more aggressive now than ever before. While my Hellions stood out of cover, hoping to avoid overwatch from not one but two packs of Grey Hunters, my opponent ran a surviving flamer from the back forward and cooked off several from the side, almost forcing a morale check. Thankfully, I still had enough left to subsequently flatten him in that area--until his THIRD drop pod full of Hunters and some outflanking Wolf scouts came down, finishing off my unit.