Come to think of it I don't remember reading anything about a DL model. Besides base/limited/sport, I don't think there were any other models. Though I did read on the Wiki something about both the Base and Limited models were based off the Concord DL/Limited.
"The Eagle came base and upscale Limited trims, both of which carried the same features as the Concord DL and Limited, respectively. A sports package was available only on the 2-door and wagon models featuring in addition to "Sport" emblems"
So it could just be a factory mix up.