The factory prefilter might as well be chicken wire, just to keep out the big chunks. Not a set spec, and not that picky.

I only ran the factory specified prefilter part number for the first couple changes, after that I just bought whatever inline fuel filter with a visible filter element was largest/cheapest from the local auto parts or hardware store.

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617 swapped Toyota Pickup, 22-24 MPG, 50k miles on swap