Looking for a Stant/MOPAR radiator cap for my 73 Dart

I am looking for a Stant/Mopar radiator cap Model#/Part# that will work on my 73 Dart 318/26" rad...A/C car with the Coolant Recovery system. I didn't think it was going to this difficult to find one, the Stant site told me a 10231 would work, but when I got it...it said VENTED on it and the one I have now DOES NOT say VENTED on it and for that reason I don't want to try it. Any help would be appreciated....thank you.
Greg