I used the heat sinks from a 2.0Ghz, PCI-X machine. They don't look any different from the 2.0Ghz, PCI machine I have.
The only diiference between the coolers located on the CPU boards themselves is the passive cooler on the 2.5 boards are taller than those on the 2.0 boards. They still work, just a little taller.
Steve E, BSOE, MIS
PowerMac G5 | Dual 2.0 Ghz | 2 GB | 32GB CF | 9800XT
AmigaOne x5000 | 8 GB | 1TB | Radeon 7770HD