here are a few places to try,if you havent already,,,
moparts,street rod section,,,,
P/15-D/24 site,,40s and 50s mopars stock and modified
the H.A.M.B big site big classified section
good luck with the car,,,there is a junk yard in N,E PA crushing has several late 40s early 50s mopars,,, place is called englers,,