What This Panel Does
The upper air deflector is the shaped panel that rides above the cab and steers air over the gap between tractor and trailer. It is not structural, but it does real work: clean airflow over the roof line, plus a barrier that keeps road debris and spray off components behind it. When it is cracked or missing, you notice it in fuel burn and in noise.
This is the left-side unit. Left and right are not interchangeable — the panel is contoured and the mounting points mirror. If you order the wrong hand you will find out at the first bracket. Confirm you are standing at the rear of the truck looking forward when you call a side, or read the hand off the old part before it goes in the scrap bin.
Construction is plastic, chosen so it flexes with cab movement instead of splitting at the fastener holes. It has to take highway vibration, summer heat soak on a black roof, winter cold, and constant UV. That combination is what kills the original: the material goes brittle, then one hard gust or one washer bay finishes it.
Why 82749505 And 20543349 Match
Both numbers describe the same left-hand upper deflector for the same VNL cab. One is the number you will find printed or stickered on the part itself or in a parts listing; the other is the Volvo reference. Numbers get superseded and re-issued over a production run — same panel, same mounting pattern, new digits in the system. That is the usual reason a single part carries two identifiers.
Cross-referencing works because the interface is fixed. The bracket locations, the contour where the panel meets the cab roof, and the hand of the part all have to stay constant for the cab, so a replacement built to those points covers every number tied to that cab configuration. We list Volvo's 20543349 for identification only — PartStop is not affiliated with or authorised by Volvo.
Treat the cross-reference as a starting point, not a guarantee. VNL cabs saw running changes and spec options across model years. Confirm fitment against your VIN, or better, pull the old panel and read the number cast or labelled on the back of it. If the old part is gone, the VIN is your only reliable path.
Before You Order
Inspect the mounting brackets and hardware while the old panel is off. A deflector rarely fails alone — if the panel cracked, something loaded it, and that load usually went through a bracket or an elongated fastener hole first. Replacing the plastic and reusing a bent bracket puts you right back in the same spot a few thousand miles later.
Budget about half an hour with basic hand tools, one person, truck parked out of the wind. Snug the fasteners evenly and do not overtorque into plastic — that is the fastest way to start a crack at a mount point. Check the panel edge against the adjacent fairing for gaps before you call it done; a lip standing proud will catch air and work itself loose.
82749505 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 82749505. 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 |
|---|---|
| Volvo | 20543349 |
Frequently asked questions
Is 20543349 the same part as 82749505?
They reference the same left-hand upper air deflector for the VNL. One is the Volvo number, the other is the number this aftermarket panel is listed under. We show Volvo's number for identification only. Verify against your VIN or the number on your old panel before ordering.
How do I tell if I need the left or the right deflector?
Stand at the back of the truck facing forward — the driver's side is left. The panels are contoured and mirrored, so a right-side unit will not line up on the left brackets. If the old panel is still on the truck, read the hand or the number off it directly.
Can I install this without drilling?
It is a direct replacement designed to use the existing mounting points, so no drilling or fabrication should be needed on a truck with undamaged brackets. If your brackets are bent or the holes are elongated from the original failure, address those first. Fit is confirmed by VIN or by the number on the part you removed.
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.