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Are you using the pf906 as primary? From the info I find it's a 4 micron filter and, IMHO not suitable as a primary. The pressure is only 6-8 psi at this location and even a slightly used 4-micron filter may present a big pressure drop, putting a strain on the IP boost pump. I'm not an expert on...

Yes, and there is also a difference in the nominal micron ratings, 40 for the original and 10 for the substitute (3511 or 86511). Primary filters/water separators on other trucks also have a larger mesh, say 30 to 50 microns. You decide what's best for yours. BTW, the original final and...

The gasket that comes with the secondary and final filters (Carquest 86540) will fit the primary, so save them. Of course, the original part number primary comes with the correct gasket also.

I agree with you... Note that the original primary is rated 40 microns. Images below show the difference. Try SECO in Augusta GA for original filters, specify the part number called out in the TMs. Should be about $20. Memphis used to have them also. The original can be wiped off and reused.