Clearly Fram took the design of using "nubs" on a fiber end cap instead of an octagon shape from Champion Laboratories, viewing this pristine Gen 1 pre-Frampion Ecore filter.
I'd use it on my OPE. I ran plenty of Gen 1 Ecores last decade on my prior truck when I lived in SE Louisiana without incident, with conventional 10W-30 in a Dodge 360 engine.