The part number for the SLI bridge that it is included with the Intel(R) Desktop Board DX58SO since revision 503 is E75252-001.
For the IOH fan the part number is E43121-001. This fan is not the processor fan.
Please contact the Intel(R) technical support near your location for the proper support, for contact information please check the following URL:
Thank you so much Sergio! That helps a lot!
You are more than welcome.