'73 318 V8 oil pressure sensor: Is NOS or reproduction available?

What is wrong with orielly's MasterPro 2-8124 or Standard Ign PS11 ? For less then $10
There is nothing wrong with those. I bought the Standard Ign one. My Dart is unrestored and in great shape. I like to use NOS or Mopar parts to keep it original if they are available. If not then that is OK too.