What You're Getting
This is a full mirror set - driver and passenger door mirrors plus the arm covers that hide the wiring and mounting hardware. On a Cascadia these mirrors take a beating from mud flaps, low bridges, backing into docks, whatever - and Freightliner ran a few variations over the years depending on cab config and options like heated glass or power fold.
A22-73907-004 is the number stamped on the bracket or molded into the housing on later production units. If your truck's a heated/power setup, this kit matches that - it's not a base manual mirror swapped in as a cheaper fix.
Comes as a set because most fleets replace both sides at once - matching wear, matching color fade, one less thing to worry about down the road.
Reading the Cross-Reference Numbers
A22-73907-000 is the earlier Freightliner part number for essentially the same mirror before a running change - could be a wiring connector update, a bracket tweak, something minor enough that Freightliner didn't change the mirror itself, just the number. The A22-75160-001 and the 2278606517/22-78606-509/22-78606-518 series are the aftermarket manufacturer's own catalog numbers for the same physical part, packaged different ways by different suppliers.
The other numbers - FRCA-1401C-RS32, A22-76858-001, TR438-FRMCC-R, 563.46111, WA128-0221, UPI43702 - are how various aftermarket brands label their version of this same mirror set. Different box, different label, same mirror underneath in most cases.
Where this gets tricky: arm length and mounting bracket angle changed a few times on the Cascadia depending on cab width and model year, and heated vs non-heated wiring harnesses aren't interchangeable without splicing. Don't just match the truck model - pull the number off your old mirror or check the VIN before you order. That's the only way to know for sure you're getting the right arm and glass combo.
Ordering From PartStop
We're in Tacoma and keep this one in stock because Cascadia mirrors get knocked off constantly - it's one of the most common calls we get. Local shops can usually grab it same-day, and we ship nationwide if you're not close by.
This is aftermarket, not a Freightliner-branded part, and we tell everyone the same thing: confirm your old part's number or your VIN before ordering. Saves you a return shipment and saves us a restocking headache.
Backed by our standard 6+ month warranty. If something's off with fitment or the glass housing after install, call the counter and we'll sort it out.
A22-73907-004 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to A22-73907-004. 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 |
|---|---|
| Freightliner | A22-73907-000 |
| Cross-Reference | A22-75160-001, 2278606517, 22-78606-509, 22-78606-518, 78606-509, 78606-518 |
| OE/Cross-Ref | FRCA-1401C-RS32, A22-76858-001, TR438-FRMCC-R, 563.46111, WA128-0221, UPI43702, A2273907005, A22-73907-007, A22-73907-001, 563.46104C |
Frequently asked questions
Does A22-73907-004 fit my 2015 Cascadia?
Probably, but Freightliner changed mirror specs a few times across Cascadia production, especially around heated glass and power fold options. Give us your VIN or the number off your current mirror and we'll confirm before you buy.
Is this the same as the WA128-0221 mirror set?
WA128-0221 is another aftermarket brand's number for what's functionally the same mirror set. Same physical part, different label - but always check spec sheets or send us your VIN so we can verify it matches your exact configuration before ordering.
Do the arm covers come pre-wired or do I need to transfer my old wiring?
The arm covers are included but you'll transfer your existing wiring harness and connectors over during install in most cases - this kit isn't a plug-and-play electrical swap. If you're not sure about your truck's harness type, ask before you install.
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.