http://www.digital-daily.com/cooling/zalman-7700cu/
Maybe get the 9500 if that Centurion is wide enough:
(i.e. the distance from socket to case cover is greater than the diameter of a CD)
1) There must be no interfering components (e.g. PSU, VGA card) within 56mm distance from the center of the CPU.
2) There must be no interfering components (e.g. ODD) within 45mm distance from the center of the CPU.
3) Case chassis cover must be distanced at least 135mm away from the motherboard.
7700 is as follows:
"No motherboard components with a height greater than 39mm (1.53inch), as well as the PSU, disk drives, VGA card, and RAM should be present within a 68mm (2.68 inch) radius from the center of the CPU."