I would like to replace my existing heater core with a modern style heater core. Does anyone know if there is an existing model that will fit in to replace the older style that are in the cars. My radiator man will make me one for about $400.00 but I was hoping to find a existing model that will work for a bit less money. I live in Canada and the existing heater does not provide enough heat. Hopefully someone has already solved this problem.