Need correct Mopar 14-16lb. radiator cap for my setup

Hi All,
I have a brand new Stant 16lb. radiator cap Model 10231 for trade. This one came up as being correct for a 73 Dart 318 original 26" rad for an A/C car. But when I got it, it said VENTED on the cap and therefore I can't use it for my reservoir type overflow setup(need NON-VENTED). I am looking for a correct new Mopar (14-16lb.) rad cap. Anyone have one? Bought this online and don't want to go through the hassle of returning it.
Thanks,
Greg