Niagara Air Parts is a distributor of Niagara oil coolers (former Harrison) units but has nothing to do with the company that manufactures the oil coolers themselves, oil coolers are built by (Niagara Thermal Products) niagarathermal.com in fact Niagara Air Parts is Canadian, not that there's anything wrong with that, they do promote a good product in the Niagara.
The Niagara units are also available through a number of other distributors but the network of finding them is difficult - a good representative is Bill Kay 419-239-8800...he can generally get factory direct in batch orders of 10 or more units and will stock the odd single unit as well. The guy's (Bill was one of them) that started Aero Classics were with original group that developed the Niagara in the early 80's when Harrison Radiator that had been building them since the 50's dropped the product line.
I can't say anything good about Pacific oil Cooler, they took over the rights to the Aero Classic name but their manufacturing, quality, reporting etc. most likely should be scrutinized closely by the FAA. I would stay away from those Aero Classic oil coolers.
