As you all know, the DC-8 doesn't have slats or Kreuger flaps on the wing leading edge, unlike most jetliners. And maybe you remember one of the differences between the original DC-8-11 and the -12 was that the latter had slots-- inboard of each nacelle, says the Putnam, and it says they were uncovered by something sliding off them when the flaps were lowered.
Do DC-8s still have these? How long and wide are/were they? When did they disappear, if they did?