What This Air Spring Does
This is a single-convolution reversible-sleeve air spring. Small bag, big job. It carries the driver's seat suspension or a cab mount and absorbs the road inputs the chassis suspension misses. Published dimensions are 11.70 in extended height, 3.66 in collapsed height, and 8.25 in bolt-circle/bead diameter. Position is listed as cab/sleeper.
Sleeve-style bags fail differently than bellows bags. The rubber sleeve rolls over the piston every cycle, so wear shows up as a scuffed band or a pinhole right at the roll line. You often will not see a blowout. You will see a seat that slowly sinks overnight and a driver who is riding on the bump stop by mid-shift.
The other failure mode is the bead and crimp. Road salt and washer chemicals attack the steel at the bead plate. Once the crimp lets go the bag unseats under pressure. If you are pulling one bag on a truck with two cab mounts, look hard at the other side before you button it up.
Why These Numbers Cross
All of these numbers describe the same physical sleeve air spring: same extended and collapsed heights, same 8.25 in bead diameter, same mounting pattern. Firestone's long catalog number W02-358-7059 carries the short number 7059, which is why the last four digits show up embedded in almost every other brand's part number in this family.
Triangle lists it as AS-7059. Automann uses ABSZ70-7059. Euclid uses E-FS7059 and Meritor uses FS7059. World American shows WA02-7059C. National Seating, which builds many of the air-ride seats this bag sits under, catalogs it as 32966-01 and 324663-01. Those last two are seat-side numbers rather than air spring numbers, which is why a seat teardown and a suspension catalog can point at the same bag from two directions.
These numbers are listed for identification only. PartStop is not affiliated with, endorsed by, or authorized by Firestone, Meritor, National Seating, or any other manufacturer named here. A cross-reference is a starting point. Confirm fit against the number stamped or printed on the bag you are replacing, or by VIN and seat model.
Before You Order
Pull the old bag and read it. The number is usually on the bead plate or molded into the sleeve. If the label is gone, measure: extended height, collapsed height, and bead diameter across the bolt circle. Compare against 11.70 in, 3.66 in, and 8.25 in. If your measurements are off, you have a different bag, not a cross.
Check the air line and the height control or seat valve while you are in there. A bag that failed early usually had help. Look for a chafed nylon line, a leaking push-to-connect fitting, or a seat valve that is not exhausting. Replacing the bag alone on a bad valve just gets you back under the seat in a month.
W02-358-7059 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to W02-358-7059. 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 |
|---|---|
| Automann | ABSZ70-7059 |
| Euclid | E-FS7059 |
| Firestone | 7059 |
| Meritor | FS7059 |
| National Seating | 32966-01, 324663-01 |
| Triangle | AS-7059 |
| World American | WA02-7059C |
Frequently asked questions
Is 7059 the same part as W02-358-7059?
Yes. 7059 is the short-form catalog number for the same Firestone sleeve-style bag that carries the full number W02-358-7059. Suppliers and seat builders often list only the four-digit short number. Verify against the number on the bag you removed before ordering.
Does this fit a National Seating air-ride seat?
This is the universal small sleeve bag used under National Seating and Bostrom style air-ride driver seats, and it cross-references to National Seating 32966-01 and 324663-01. Seat bases vary by model and build year, so confirm the number on the bag in your seat or check the seat model tag before you order.
How do I tell if the seat bag is leaking or the valve is bad?
Air the seat up, shut the truck down, and come back in an hour. If the seat is on the floor, spray the bag, the bead plates, and every fitting with soapy water and look for growth. If the bag holds but the seat still will not stay up while driving, the height valve or the exhaust side is the problem, not the air spring.
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.