What You're Actually Buying
This is a molded lower radiator hose, not straight stock cut to length. The bends matter here - Series 60 installs need the hose to route around the water pump housing and clear the fan shroud without collapsing under vacuum when the thermostat opens.
2.5 inch ID and 17.63 inch length is the spec, but molded hoses aren't universal even within a 'Series 60' family - Freightliner ran different chassis configurations over the years and the hose routing changed some. This one replaces 05-21303-001 specifically.
Rubber compound is built for coolant and heat cycling under a hood that runs hot all day, every day. It's a wear item - don't wait until it's bulging or cracked at the clamp ends to swap it.
Reading the Cross-Reference Numbers
Dayco 72967/E72967, Gates 22877, ACDelco 26478X, Continental 66812/E91716 - these all show up because the hose manufacturers cross their own catalogs to the same OE dimension and bend pattern. Different labels, same mold in most cases.
Where guys get burned is assuming any 'Series 60 lower hose' fits any Freightliner. Two trucks can share an engine but not a hood, radiator mount, or frame length - that changes hose routing even if the ID matches. A hose that's a half inch off on length either won't reach or sits under tension it wasn't built for.
Surest way to confirm: pull the old hose and read the number molded into the rubber, or check your Freightliner chassis VIN against the application. Don't just match ID and rough length off a tape measure - the molded bends are the whole point of buying the right part number.
Ordering From PartStop
We're in Tacoma, and if you're local we can usually have this on the counter same day - useful when a truck's down and you're not trying to explain a two-day wait to your dispatcher.
Ship nationwide too, standard freight, and we stock this one regularly since Series 60 trucks are still working all over the country.
Comes with our standard 6+ month warranty. If the number you pull off the old hose doesn't match what you ordered, call us before you install it - cheaper than finding out after it's clamped up and full of coolant.
0521303001 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 0521303001. 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 |
|---|---|
| DAYCO | 72967 |
| Dayco | E72967 |
| GATES | 22877 |
| ACDelco | 26478X |
| CONTINENTAL AG | 66812 |
| Continental Belt | E91716 |
| Unknown | 9512 |
Frequently asked questions
Does 05-21303-001 fit my Freightliner?
Depends on chassis and hood configuration, not just having a Series 60 under it. Pull the old hose and check the number stamped or molded on it, or give us the VIN and we'll confirm the application before you order.
Is this the same as the Gates 22877?
Same dimension and application, different manufacturer catalog number. Gates cross-references to this hose because it's built to the same OE spec - functionally it's the same part under a different label.
How do I know if the hose is actually bad versus just a loose clamp?
Check for soft spots, cracking near the clamp ends, or bulging when the engine's hot and running. A loose clamp usually just weeps at the connection - if the rubber itself feels spongy or split, replace the hose, don't just retighten the clamp.
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.