You know I was going to chime in on that yesterday and got interrupted. I'm not necessarily opposed to an aftermarket part like that, I would just be sure that you have some recourse if something doesn't measure up. Sometimes a "direct replacement" isn't very direct. Also, there is an evaporator temp sensor that slides into a tube like whole on the end of the core. It sort of looks like a bullet with wires sticking out of the firing end. I have seen more than one that would not accept the sensor because of sloppy soldering when it was built. Of course, if YOU massage the core so it will fit, you could be left with a core that has no warranty or can't be returned.

Like I said, as long as you are satisfied they will deal with you if something isn't kosher, I'd say go for it.

Good luck!