The OEM FL-1995 measures 4.25 OD. The Donaldson ELF7405 (OD: 4.65) crosses to a Baldwin B7249-MPG, Fleetguard LF3566, WIX 51792XE, and a Cat 1R0716 all of which measure 5.3+" OD. It's said from the powerstroke world that the Donaldson ELF7405 will fit those engines so I'm sure it would fit an IDI. The others that are comparable mentioned before I think would be too large in diameter to clear the oil pan. The only way to know would be to try one. So far it appears that the Donaldson ELF7405 is the best filter out there that will fit. At least by its specs.