Need new copper or brass heater core

Thanks, but according to their website, it says its aluminum. I might have to go that route if I can find a copper one by next week.
I looked it up and that is odd... Mine is definitely copper and the other part# on the bottom takes me to another aluminum one...
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2 years ago, I looked and looked and looked and finally bought.

Guess what, it didn't fit.

Had a reputable radiator shop braise the original. Haven't thought about it since.
 
Has anyone used the one from Kirbans? Im about to give up on finding a copper one, but I want to find one that fits correctly and works correctly.
 
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