I found them brand new at my local radiator shop. I also drive a 70 with air but, a year after I got the truck I was fooling around with AC and decided to loose the whole system. I had a spare parts truck that had beev sitting a while(same year) took the heater box out cleaned it up and got a new core for $100 from the local radiator shop. Put it in my truck worked great, then I took the truck to
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Dodge Sweptline Truck General Discussion