Need Napa Part# or equivolent

[DukeBoy88]

I'm converting my truck's fuel system to run 2 filters on my M1008. The factory filter was gone when I got the truck and in it's place was a NAPA 3123 fuel/water seperator rated at 12micron I believe. I purchased a Racor 2 micron 645 to use as my final filter and I planed on remounting the NAPA base directly after the tank before my new E8012S Autozone electric fuel pump. I'm looking for a spin on filter that will fit the same base as the 3123 but has a micron rating around 20. If there isn't one I'll buy another 3123, but thought I'd check.

thanks in advance,
Dave