On my Farmtrac 545, the air filter elements have Ford part numbers on them that interchange to NAPA 2533 and 6523. The oil filter seems to be NAPA 1452 but there are several numbers which will work. Except for the fuel filters, all seem to be the same as a Ford 3910 or 3930. Mine has (2) spin on fuel filters that I have not been able to interchange. One note, the engine oil filter did not have enough thread engagement until I found out the nipple the filter screwed onto was not bottomed and would screw in too deep. I Loc-tited it at the proper stick-out.
Tom W.