Bearing dust cap part #?

Yesterday I was driving down the road and lost my passenger side dust cap on my 64 valiant with drum brakes.. I went to practically every parts house in the area and they dont carry it! Do you guys know the part number so I can order it online? Or are they not even being made anymore? Nothing pops up on ebay that I have seen! If any of u guys have a couple laying around I'll buy em off of u! Thanks very much :D