heater core question

[pm128]

So I have 85 gl10 and I am in the process or replacing my heater core, I got one form parts america but it is not the same as what is in the car. The one I got is much fatter and not as wide, it does not fit in slot where the old one is, also it has short connectors. The stock one had long copper connectors that go throught the fire wall.

 

Does annyone know the part # ar a part # or where I can this correct heater core. The one that goes thought the firewall. Since my car is all ripped apart now.

 

 

 

thanks

P