These have sort of gone off line at the moment.  You can have yours repaired at a radiator shop.  Being repaired is the easy part, it's getting' the buggar out that's a 10 to 20 hour job!  Wood dash cars are easier than the vinyl dashed ones! Why? Jensen having had to get enough of them out of the cars decided to provide an actual access to the heater core on the later cars. Imagine that! What goes in has gotta come out!