This was the one I was looking at as well. https://www.amazon.com/dp/B004KMO8FM/?tag=wranglerorg-20OSC 98024 from rockauto.
I looked for a copper brass aftermarket unit, but to no avail. All the aftermarket are aluminum.
Why I chose OSC?
I ordered a heater core from a mopar dealer online. They claimed they had the oem in stock. When I received it, it clearly was not an oem, but an OSC. That particular dealer uses OSC if they have to replace a heater core and sells them to the public for about $250. I assume, perhaps misguided, that they did some research and the osc was a good unit. But I had nothing else to go on in terms of determining which aftermarket was best.
Changing it out is a nightmare job, so hopefully it lasts. I had to change out my ac evap as it had a leak. My heater core was still fine. I changed it as preventative maintenance. I figured 20 yrs of service was enough.
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Out of curiosity...did yours come with or without the foam weatherstripping on it?
As for me, my A/C is fine, no leaks as far as I know but I rarely use it up here in the PNW now, however my heater core has a leak as every time I use my defrost, I smell coolant vapor and it comes out of my vents. I need to replace this this summer, before it gets too cold.