I have the filter box in my hand, having just changed one on my W46, OEM#35828
The replacement Fram # PH2921 according to the catalog.
But check visaully against the OEM cartridge. I seem to remember than this filter does not seal correctly because OEM has a concaved plate for the female thread, and the Fram is not concave, and does not pull up tight on the gasket
Please let us know--I need to buy standbys and the W/bekes OE are expensive.