NAPA was being supplied by Proliance (they bought Modine several years back) but due to them not keeping up with NAPA's demand, they were dropped as a supplier. They made a very good product when they were Modine and better than average one as Proliance. The current supplier is Spectra, a Canadian company that sources most numbers from China. They're making a fairly decent product, so far. I've had zero warranty issues since the changeover and I sell ALOT of radiators a month. I'm currently running one in my truck and have no issues with it other than it's slightly lighter gauge than that of OE. Justice ordered one that came in from Spectra and he didn't like it. Reordered one from Proliance and IIRC, said it was acceptable. He's deployed right now, but he may chime in at some point. HTH.