Got a free Wix 57148, a filter intended for Harley motorcycles. But specs-wise it is similar to 51348, which is what my 2010 Escape 2.5L calls for. Thread size, physical size, etc. are comparable. Any reason to not use this filter?
WIX has defined their beta ratio differently than industry standards, and maybe they do the same with what they call "Nominal" efficiency. If they show the beta to be 95% @ 20 microns, and show the "Nominal" efficiency to be 21 microns, then it could be "Nominal" to them is what most call "Absolute" (98%).