I don't know if we have many parts hoarders here, but it's worth a try.
I need a cooler (heatsink and fan) for an Intel Core Duo or Core 2 Duo CPU. Although these CPUs were intended for "mobile" computing, they were also used in the Intel Mac Minis and some of the iMacs.
For example:
Mac mini "Core Solo" 1.5 1.5 GHz Core Solo (T1200) Mac mini "Core Duo" 1.66 1.66 GHz Core Duo (T2300) Mac mini "Core Duo" 1.83 1.83 GHz Core Duo (T2400) Mac mini "Core 2 Duo" 1.83 1.83 GHz Core 2 Duo (T5600) Mac mini "Core 2 Duo" 2.0 2.0 GHz Core 2 Duo (T7200)
iMac "Core Duo" 1.83 17-Inch 1.83 GHz Core Duo (T2400) iMac "Core Duo" 2.0 20-Inch 2.0 GHz Core Duo (T2500) iMac "Core Duo" 1.83 17-Inch (IG) 1.83 GHz Core Duo (T2400) iMac "Core 2 Duo" 1.83 17-Inch (IG) 1.83 GHz Core 2 Duo (T5600) iMac "Core 2 Duo" 2.0 17-Inch 2.0 GHz Core 2 Duo (T7200) iMac "Core 2 Duo" 2.16 20-Inch 2.16 GHz Core 2 Duo (T7400) iMac "Core 2 Duo" 2.16 24-Inch 2.16 GHz Core 2 Duo (T7400)