What style tips for Dart Sport?

Dart Sports never came with 340's do you mean 360's

You are mistaken my friend my 73 Dart Sports came with the 340 NOT 360's and it has the original 340 in it now! I can prove it as its a documented #'s matchng car and states 340 from the VIN and Bld sheet. Oh and yes rectangular exhaust tips mine are original to the car also