What This Filter Is and Where It Goes
This is a primary engine air filter, the big radial-seal element that sits in the air cleaner housing between your intake stack and the turbo. Its job is keeping dirt out of the engine before it gets anywhere near the compressor wheel, so it's not a part you want to cheap out on or run past its service life.
AF26103 shows up across a range of International (Navistar) and Kenworth trucks built around Cummins ISX and ISM engines. The housing and seal diameter are what matter here, not the truck badge on the hood - International and Kenworth both used the same Cummins-approved air cleaner setup on plenty of models, which is why one filter number covers both.
How the Cross Numbers Line Up
International/Navistar lists this as 3551814C1 if you're pulling from a parts book. WIX runs it as 49088 or 549088 depending on packaging, Baldwin calls it RS4862, Carquest has it as 83088, and Fram's version is CA10305. These aren't random - they all cross because the filter media, pleat count, radial seal OD, and overall height match the Cummins spec for this housing.
Where guys get burned is assuming any 'similar looking' round filter will work. Radial seal filters depend on exact OD and seal groove dimensions to seat right in the housing - too loose and you get dirt bypass, too tight and it won't seat, which means unfiltered air getting past the seal either way. Pull the old filter and check the number stamped or printed on the end cap, or better yet, run your truck's VIN to confirm before you order.
Ordering From PartStop
We keep this one in stock in Tacoma for walk-in and same-day pickup, and we ship it out same day nationwide if you're calling from the road or another yard. At $87.99 it's not the cheapest filter on the shelf, but a filter that doesn't seal right costs you a lot more in turbo repair down the line.
This is an aftermarket replacement filter, not a Cummins-branded part, so give us your VIN or the number off the old element before you order and we'll confirm fitment. Comes with our standard 6+ month warranty against defects.
AF26103 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to AF26103. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| International/Navistar | 3551814C1 |
| WIX | 49088, 549088 |
| Baldwin | RS4862 |
| Carquest | 83088 |
| Fram | CA10305 |
| Aftermarket | P613336 |
Frequently asked questions
Does AF26103 fit my International truck?
Depends on the engine and air cleaner housing, not just the make. AF26103 fits certain International trucks running Cummins ISX or ISM engines, but International also used other air cleaner setups across their lineup. Give us your VIN or the number off your old filter and we'll confirm before you buy.
Is this the same as the WIX 49088?
Same filter spec, different brand stamped on the end cap. WIX 49088 (and 549088) cross-reference to AF26103 because they share the same media, seal diameter, and height for this Cummins air cleaner housing. Confirm by matching the number off your old element if you're not sure which one you're pulling.
How do I know when this filter needs changing?
Most fleets run these on a mileage interval, but if your truck's got a restriction gauge on the air cleaner housing, that's your real answer - change it when the gauge hits the red zone, not just on a calendar. Running it too long chokes down airflow and can hurt fuel economy before it hurts anything else.
Not sure it fits? We check before you pay.
Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
More cross-reference guides
Need the part, not just the reading?
Every part below is a Premium Quality aftermarket Direct Replacement with published OEM cross-reference numbers, a 6+ month warranty and same-business-day shipping from Tacoma, WA. Not sure it fits? Run your VIN — or call and a person who knows trucks will verify fitment before you pay.