The micron rating of 20, the paper medium and the size of the filter would make it plug up too early I guess.
Mann-Hummel plastic inline prefilters have 20micron paper medium for the gasoline and 200micron nylon mesh for the diesel ones. *
Options:
Hengst H102WK - 150 micron
Mann-Hummel wk31/4 - 200micron
Wix 33007 -50 micron (?!)
Fram P4174 -125micron
These are all 8mm Inlet&Outlet ,straight.
For L-shaped & 8mm inlet-outlet cross reference Mann-Hummel wk31/5.
The engine has a secondary(fine) filter,correct?
*P.S. well not all of them. Some are noteceably "coarser" on the photos like this one
https://www.mann-filter.com/de-de/katalog/suchergebnisse/produkt.html/wk31/11(10)_mann-filter.html
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