Come to think of it, I believe the Lackwanna ones were Lionel, I'm not sure K-line did that road name. But unfortunatly, there are none of the ore cars in that livery. Best bet might be the RMT ore cars in the Bethlehem Steel Lackawanna Livery.
Hope somebody has the molds, both for the Porter, and those great little mine ore cars.
BTW, thanks for the tip on the Pioneer tender. Despite my line below, I think that would be a great look for one of my Porters (now up to 4!) and am determined to track one down!