Can't locate a heater core to fit my van
 

Need help on where to buy the front heater core on a 1994 Ply Grand Voyager LE 3.8 liter with A/C. Mine has a "V" space on the top of the heater core and everything I have looked at does not have the "V" on the top. I have tried multiple places and none of them have been able to supply the correct part. I am thinking of buying one that does not have the "V" and taking it along with my old one and having a radiator shop switch tops. I went to a dealer and they told me it would cost $400 for a heater core? I don't even know if there's would fit either.
Does anyone have any suggestions?
thanks for the help