hooker headers in a 1965 dart gt

I was checking Summit´s catalog and found a hooker header number HOK5901HKR,that is for 67-82 a body.My question is if it is possible to put this header in my 65 dart(273 engine).There are differences between 65 to 67 car structure to accept this header?????.I ask you because it have a nice price 169 bucks....