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It just kinda depends, they could be in house units, or delco/delphi units, or even pinoeer or audiophile units. It just all depends on what level and which run they used that day.
yeah, i used to work at a factory that provided oem parts to ford and we always had wiring harnesses or labels left in ship crates.....pioneer, jvc, sony...you name it...oh yeah, not sure about now but all oem from the factory filters at one time were made by WIX