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Cooling fan - exact part?

The left fan in my MacBook Pro 17" 2.5GHz (Model A1261) has developed a noise (fluttering sound, bearings?). I got a replacement (sold as for this model), but it looks different from the original.

The original looks like the one on iFixIt's page for this fan, but the replacement I got looks like the one on the page for the Model A1151: same appearance (larger holes than the one in the computer now), design (fan has fewer vanes), manufacturer (Delta), even part # (KDB04505HA). Its connecting cord however is at the correct angle for the 1261 MBP (5 o'clock instead of 3 o'clock). Is this the only functional difference between the fans for the various MBP 17" models?

I'm concerned that having two fans of different designs in the computer might be a problem, since they work together. Does anyone know if this could be a problem?

MacBook Pro 17" (Model A1151) Left Fan Image
MacBook Pro 17" (Model A1261) Left Fan Image
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Send it back. That fan is not listed as a replacement for your machine.

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Comments:

Thanks for your response.

Actually, a Google search for the Apple Part # 922-8395 finds at least a half dozen online dealers offering fans that look like the one I got. So it seems the situation is a little confused. I'm awaiting assurance from iFixit that their fan is indeed as pictured; if so I'll probably buy that and send this one back.

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Just because parts LOOK alike does not mean they are Interchangeable. For instance, look at RAM.

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Well, iFixit assured me the fan would be as pictured, so I ordered it. When it arrived it was the Delta fan, the same as the one I already have. Meanwhile, the first vendor assured me the fan came from Apple and was the official replacement part. Apparently Apple is now using the same source for replacement fans for all the MBPs. So I'll use the first one, while the second one goes back to iFixit.

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I would contact iFixit for a confirmation on the part. If they confirm I would ask them to add the photo of the new one to the product list to avoid confusion in the future.

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