NAPA/Wix for 3/8 inline metal filter, you can’t see inside, but it’s cheap so change annually. I can’t remember NAPA number but Wix 33033
As others said, 3/8=-6 AN, The way to do the math is take the AN number and put over 16. 6/16 = 3/8 inch, 8/16 = 1/2 inch