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The short version
- A Mariner wheel bearing on the 2004 to 2007 vehicles is side specific at both ends, which is rare.
- 513232 is cited for the left front and 513233 for the right. The rear is 512312 left and 512313 right.
- Ordering two of any one number leaves you with a part you cannot fit.
- From 2006 the front consolidates to 515078, and the rear to 521000.
Handed parts usually appear at one end of a vehicle. This one has them at both, on the same model years, which makes it the fussiest ordering job in the Mercury range.
Four different parts, four corners
513232 left front, 513233 right front, 512312 left rear and 512313 right rear on the 2004 to 2007 vehicles.
Note the corner before you order anything, and order one of each if you are doing a pair.
Handed front hubs are rare. The Jeep Liberty is the only other one recorded here, on the Liberty page.
Mariner wheel bearing part numbers
| Years | Detail | Number |
|---|---|---|
| 2004 to 2007 | Front, left | 513232 check price |
| 2004 to 2007 | Front, right | 513233 check price |
| 2004 to 2007 | Rear, left | 512312 check price |
| 2004 to 2007 | Rear, right | 512313 check price |
| 2006 to 2010 | Front | 515078 check price |
| 2006 to 2010 | Rear | 521000 check price |
Every model year this chart resolves: 2004, 2005, 2006, 2007, 2008, 2009 and 2010.
Price links lead to Amazon searches for that number. As an Amazon Associate this site earns from qualifying purchases.
Cross referencing is on the cross reference page.
The Ford underneath
The Ford Escape of the same era shares this hardware, and the Escape sells in far larger numbers.
A search under Ford returns considerably more listings for the identical part.
That page is the Escape page, and the make overview is on the Mercury page.
A closed badge with a live supply
Ford wound Mercury down in 2011, which makes people assume parts will be scarce. They are not.
Every hub here is a shared Ford component and the Ford relatives kept selling for years afterward.
The 521 number series
The 2006 onward rear is cited as 521000, which sits outside the 512 and 513 families used almost everywhere else on this site.
That is a different family within the same catalog rather than a different kind of part. It matters only because a search assuming the usual prefixes will miss it.
Diagnosing a Mariner wheel bearing
- Note the corner before ordering for a 2004 to 2007 vehicle.
- Search the Ford Escape listings too, since the hardware is shared.
- Weave at road speed and note which side loads the noise.
- Rock the wheel at twelve and six.
- Compare hub heat across each axle after a drive.
Those are on the checking page and the tire noise page.
Common questions
Is the Mariner wheel bearing really handed at both ends?
On the 2004 to 2007 vehicles yes. Four corners, four different numbers.
What if I ordered two of the same?
One will not fit. Order one of each when buying a pair.
Can I buy a Ford Escape part?
The two share hardware. Check the number rather than the badge.
Why does the rear number begin 521?
It is a different family within the same catalog, not a different kind of part.
Can I still get parts?
Yes. These are shared Ford components and the relatives kept selling.
Do I need a press?
No. These use bolt on hub units.
Should I replace both sides?
Only what is worn.