Eddie, they're not true OEM, but they are a proper replacement as opposed to something that just fits. We carry the same filters.
Probably the worst "almost fits" case is the donut type air filters used in 1500-1700-2000 and others. The NAPA almost fits is something like 1/64" or 1/32" off the OEM, but it is enough to allow dust to be pulled in, and in the wrong environment, can lead to premature wear. We, and many other dealers, carry an exact replacement for that OEM for literally a few $$ more than NAPA, maybe $8 more than a generic version of the NAPA. We rebuilt an engine for an individual using the "almost fits" a few years ago (maybe 3, maybe 5.....working on memory here)---he was tilling 35 acres of truck garden seasonally, kicking up lots of dust, and literally ate up his rings. He bought a case of the aftermarket replacement air filter when he picked up his tractor.