Bolters,
First off, thank you everyone. And sorry for my steep learning curve and not quite correct questions.
My heater looks like achipmunks, only rustier and dirtier - thanks so much for posting the pics. So it's a Fresh Air heater I am in search of.
My heater is in sad shape some pieces are salvagable. However, the metal case surrounding the core is rusted out. Its also Missing the control valve and rod assembly.
I'll take the advice of posters and will check ebay and post on a wanted. I'm also checking out the many links this site has for vendors.
Kindest regards,
Stickler
Louisville, KY