What This Part Is and What It Fits
This is the complete driver side (left) headlight housing for the Freightliner Cascadia, covering the 2018 through 2024 build years. It's not a bulb or a lens kit — it's the whole assembly with housing, reflector/LED module, and wiring pigtail attached.
Cascadia went through some running-light and connector changes across those model years, so 2018 isn't always identical to a 2023 truck under the skin. The A6601512002 number is what Freightliner used across that span for this side, but the safest move is checking the number stamped or printed on your old housing before you order.
Why These Cross Numbers Show Up Together
The numbers in the table — A66-01405-002, A66-01512-004, 4319206, the 564.46001 family, AM56446001 — all trace back to the same physical headlight built for this application. Some are Freightliner's own part numbering at different points, others are the Hella/aftermarket manufacturer codes for the identical housing, and 4319206 shows up as a common freight-catalog cross.
Where guys get burned is assuming any number with 'headlight' near it works. Watch the connector plug style and whether your truck has LED or halogen — Freightliner made changes mid-run, and a housing that's mechanically correct can still have the wrong wiring end for your harness. Bulb type and connector pinout are the two things to physically match, not just the box art.
If your old part number doesn't match anything in the list exactly, don't guess. Pull the VIN or read the number off the housing and call — takes us two minutes to confirm against the build sheet.
Ordering From PartStop
We stock this one at the Tacoma counter and it typically ships same day if you order before cutoff. Local fleets in the Puget Sound area can usually get it same-day or next-day depending on dispatch schedule.
Nationwide shipping is standard for everyone else — most orders land in 2-4 business days depending on where you're at.
Comes with our standard 6+ month warranty. This is an aftermarket housing, built to interchange with the OE number, not a promise it'll bolt on with zero adjustment on every single Cascadia trim — confirm fitment by VIN or your old part number before it ships, and we'll make sure you're getting the right one.
A6601512002 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to A6601512002. 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 | A66-01405-002, A66-01512-004, 4319206, 564.46001, 564.46001LM, AM56446001, FRT-A66-01512-002, S-29368, S2936, FRCA-1303D-L |
Frequently asked questions
Does A6601512002 fit my 2019 Cascadia?
Most likely yes, but confirm with your VIN or the number off your current headlight housing first — Freightliner made some running-light and connector changes across the 2018-2024 run and we want to make sure the plug and bulb type match before you order.
Is this the same as the Hella 564.46001 headlight?
They cross-reference to the same physical assembly for this application, yes. Hella made versions of this housing under their own part numbers, and 564.46001 is one of those. Still worth checking your old part number against ours before ordering to be sure.
Can I just replace the bulb instead of the whole housing?
Not with this style Cascadia headlight — it's a sealed assembly, not a bulb-and-reflector setup you can service piece by piece. If the housing's cracked, fogged, or the LED module's failed, you're replacing the whole unit.
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.