What 031-01520 Covers
031-01520 is a quarter fender kit measuring 24 inches by 24 inches, molded in plastic rather than formed steel. It hangs off the frame or a bracket behind the wheel group and catches the spray, rock, and salt slurry that would otherwise blast the lower quarter panels, fuel tanks, and anything mounted behind the tires.
The kit ships as a complete unit and bolts on using existing frame holes in most applications. No welding, no fabrication, and the install is reversible if you move the fender to another chassis later. Standard hand tools handle the job on a typical mount.
Plastic construction keeps the weight down, which matters more than it sounds. A heavy fender loads the mounting hardware every time the truck hits a seam or a rough crossing, and that load is what eventually elongates the bolt holes or snaps the bracket. Less mass means less fatigue at the mount.
Why These Numbers Cross
031-01520 and World Truck Parts FIT-742PS51 describe the same 24 x 24 plastic quarter fender configuration. Quarter fenders are cataloged primarily by panel dimension, material, and mounting style, so once those three match, the parts are functionally the same piece regardless of whose number is stamped on the box.
That is why the interchange works here. There is no engine code, no electrical calibration, and no sealing surface to match. The variables are the 24-inch by 24-inch panel size, the plastic material, and the bolt pattern that lands on standard frame holes. Different suppliers assign different SKUs to identical hardware.
The other manufacturer number is listed for identification only. PartStop is not affiliated with, endorsed by, or authorized by any other manufacturer, and FIT-742PS51 appears here strictly so you can confirm you are looking at the same part you already have.
Check Before You Order
Measure the old fender before you buy. Quarter fenders come in several panel sizes and a 24 x 24 will not cover the same footprint as a longer panel. Also measure your available clearance between the tire and the frame rail, since a fender that is correct on paper can still foul at full articulation.
Pull the number off the old part or verify by VIN if the original is gone. A cross-reference is a starting point, not a fitment guarantee. Inspect the bracket and hardware while the fender is off, because a fender that tore loose usually took the mount with it, and a bent arm will crack the new panel too.
031-01520 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 031-01520. 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 |
|---|---|
| World Truck Parts | FIT-742PS51 |
Frequently asked questions
Is 031-01520 the same part as FIT-742PS51?
They cross to the same 24 x 24 plastic quarter fender configuration. Both use the same panel dimensions, plastic material, and standard bolt-on mounting. Confirm the size against your old fender before ordering, since the cross-reference identifies the part but does not guarantee fit on your specific chassis.
Will this fender bolt to my existing brackets?
In most applications it uses factory frame holes and needs no welding or fabrication. That said, bracket setups vary widely on universal trucks and trailers, especially where a previous owner has modified the mount. Test fit before you torque anything down and replace any bent or elongated hardware.
Why do plastic quarter fenders crack?
Usually from mounting stress rather than the panel itself. A bent or loose bracket lets the fender flex against a fixed point every time the truck moves, and the panel fails at the bolt hole. UV exposure and repeated salt cycles also embrittle older plastic. Check and straighten the mount whenever you install a new fender.
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
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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.