The cooler in the OP uses a 100MM X 12MM fan.
One of these fans would probably be able to replace the old one:
http://www.kustompcs.co.uk/cgi-bin/s...00MM&ACTION=Go!
These are the specifications for the fan:
• Model Name: Shuriken CPU Cooler
• Model Number: SCSK-1000
• Compatibility:
-Intel: Socket 478 All Speeds, Socket T / LGA 775 / 1366 i7's All Speeds
-AMD: Socket 754 All Speeds, Socket 939 All Speeds, Socket AM2 All Speeds, Socket AM2+ All Speeds, Socket 940 All Speeds
• Dimension: 105x116x64 mm (Overall Dimension), 100x100x12 mm (Fan Dimension)
• Fan Speed: 650±200 rpm ~ 2,200 rpm (±10%)
• Fan Noise: 10.5 dBA ~ 31.67 dBA
• Air Flow: 11.81 CFM ~ 31.91 CFM = 20 m³/h ~ 54 m³/h
• Weight: 355 g
The main issue the Scythe fans I suggested,although the right size are not PWM. Hence,ideally would go for the higher CFM fan,although noise at idle will be higher.