What You're Looking At
This is the passenger-side (RH) headlight assembly for Freightliner Cascadia trucks built 2018 through 2023. It's the LED version, not the older halogen setup, so don't get it mixed up with earlier Cascadia lights that used a different housing entirely.
It bolts into the same mounting points as the factory unit and carries the same connector layout, so wiring should be plug and play. That said, Freightliner made small changes across model years, so a 2018 truck and a 2023 truck aren't guaranteed to be identical under the hood of the assembly even though the outside looks the same.
Surest way to know you've got the right one: pull the old unit and check the number stamped or molded on the back housing, or run the truck's VIN. Don't just go by year alone.
Why These Numbers Cross
A6601512003 shows up under a few different labels because Freightliner's parts numbering has shifted slightly over the years, and the aftermarket guys who build to that spec stamp their own part numbers on the box. Numbers like A66-01512-004, FRCA-1303D-R, 564.460108C, 564.46002, and 4319176 all reference the same physical headlight assembly built to fit this application.
The Freightliner OEM number A66-01512-005 is close but not identical — it's a related revision, so if your old part carries that number specifically, double check before assuming it's a straight swap. Small running changes to the housing or connector can happen even within an interchange family.
When you're cross-referencing, the number on your old headlight is your anchor. Match it against what's listed here, and if it's close but not exact, call us or send a photo — we'd rather look at it twice than have you install it once and find out it's wrong.
Ordering From PartStop
We're in Tacoma and keep this one in stock for same-day pickup or local delivery if you're running a fleet in the area and need a truck back on the road today. If you're outside the Puget Sound, we ship nationwide and most orders go out same day if placed before cutoff.
This part comes with our standard 6+ month warranty, so if something's off with the unit itself, we'll handle it. It won't cover a fitment mismatch from ordering off memory instead of the VIN, so do that check first.
Have your VIN or the old part number ready when you order. It saves everybody a return shipment and gets your truck back together faster.
A6601512003 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to A6601512003. 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 |
|---|---|
| OE/Cross-Ref | A66-01512-004, FRCA-1303D-R, 564.460108C, 564.46002, 4319176 |
| Freightliner (OEM) | A66-01512-005 |
Frequently asked questions
Does A6601512003 fit my 2019 Cascadia?
Likely, but confirm with your VIN or the number off the old headlight before you order. Freightliner made changes across the 2018-2023 run, and the safest bet is matching the actual part number, not just the model year.
Is this the same as the FRCA-1303D-R headlight?
FRCA-1303D-R crosses to this same assembly — it's an aftermarket-branded number built to the same fitment and spec as A6601512003. Still worth checking your old unit's number since running changes happen.
What's the difference between A6601512003 and the Freightliner number A66-01512-005?
They're closely related but not confirmed identical — A66-01512-005 is a Freightliner OEM number that may reflect a running change. If your old assembly is stamped with that exact number, check with us before ordering to make sure the housing and connector match.
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.