What This Air Spring Does
This is a cab spring, not an axle spring. It sits between the frame rail and the cab or sleeper mount, or under an air-suspension seat, and absorbs the ride harshness the chassis suspension passes through. Load per unit is low compared to a drive-axle bag, so the sleeve is thinner and the failure mode is different.
The reversible-sleeve design means the rubber sleeve rolls over the piston as it strokes instead of folding like a convoluted bellows. That gives a soft, near-linear rate over a short travel. Representative dimensions for this family are roughly 10.1 in extended, 2.5 in compressed, and 8.0 in at design ride height, though bag-to-cap ride height across the 7013-cap group varies from about 6.5 to 11.5 in.
Position matters when you order. A cab mount and a seat mount can share the same cap casting and stud pattern but run a different piston and a different ride height. Pull the old unit, read the number off the cap, and compare it against the interchange list before you commit.
Why These Numbers Cross
All the listed numbers describe the same physical envelope: a reversible-sleeve bag built around the 7013-style cap, with matching stud spacing, port thread and piston diameter. Because Class 8 cab mounts were sourced from several suppliers over the years, the same hole pattern picked up a number from each of them. The bag is interchangeable even though the box is not.
That is why ContiTech 67452, Goodyear 1S5-057, 1S5-120 and 1S4-007, Link 1102-0075 and Mack 227QS33 all land on the same shelf. Firestone W02-358-7038 and W02-358-7073 are siblings within the same 7013-cap group — same cap, different piston or sleeve length, so they show up in cross tables but are not always a swap for each other.
These numbers are printed for identification only. PartStop is not affiliated with, endorsed by, or authorised by Firestone, ContiTech, Goodyear, Link, Mack or any other manufacturer. Use the cross-reference as a starting point and confirm fit by VIN or by the number stamped on the part you are removing.
Failure Signs And Install Checks
Typical symptoms are a cab that leans to one side overnight, a hard bang over expansion joints, or the air dryer cycling more than it should. Soap the sleeve and the port with the system charged. Cracks around the rolling lobe, a chafed spot where the sleeve rubs the mount bracket, or a wet ring of grit around the bead are all end-of-life.
Before install, dump the air and support the cab. Check the piston and the bracket for corrosion scale — a rough piston shreds a new sleeve in weeks. Chase the stud threads, use a new nut where the old one is rusted, and torque evenly so the cap seats flat. Route the air line so it cannot pull on the port at full articulation.
W02-358-7013 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to W02-358-7013. 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 |
|---|---|
| ContiTech | 67452 |
| Firestone | W02-358-7038, W02-358-7073 |
| Goodyear | 1S5-057, 1S5-120, 1S4-007 |
| Link | 1102-0075 |
| Mack | 227QS33 |
Frequently asked questions
Will W02-358-7013 fit my Kenworth cab mount?
It fits legacy Class 8 conventionals from Mack, Kenworth, Freightliner, Western Star and Volvo that use the Firestone 7013-cap reversible-sleeve mount. That covers a lot of trucks but not all of them. Confirm by VIN or by reading the number stamped on the spring you are pulling off — the cross-reference is a starting point, not a fitment guarantee.
Is this the same as W02-358-7038 or W02-358-7073?
They belong to the same 7013-cap family and share the cap and stud pattern, but the piston or sleeve length can differ, which changes ride height. They appear together in cross tables for that reason. If your old part reads 7038 or 7073, measure your installed height before assuming a straight swap.
Can I use this under an air ride seat?
This family covers both cab/sleeper mounts and air-suspension seat mounts, and the two often share a cap. The difference is usually ride height and piston diameter. Check the number on the seat spring you are replacing and match it to the interchange list rather than going by the mounting pattern alone.
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