Anyone know the manufacturers part # for the LW16/600 controller board fan?

Hi,
Does anyone know the manufacturers part #, not the Apple part #, for the LW16/600 controller board fan?

My controller board fan died so I need to replace it. I know the Apple part #, 922-0948, but since I can't find an OEM replacement, I need to replace it with an after-market fan. The OEM fan was accidentally thrown out, thus I need to get the manufacture's part # to find a comperable replacement, hopefully one that is quieter.

Thanks