Quoted from RTSMikeM:Digi-key is pretty hard to search. Do they have the cut off headers too?
Ever since GPE has stopped stocking parts, I just use that website for part numbers. Copy the molex part number and put in into Digikey. I have always used tin plated contacts but I doubt copper ones would be problematic. You may want to replace the plastic housing too if it's damaged or if you don't want to remove all the old pins.