Tested and working - only had a light dusting on the edges of the fan blades (so light use) - but I have cleared the dust and they are ready for use!
Dell PowerEdge 2950 2970 Server Fan PR272 0PR272 YW880 PFC0612DE DC471 JC972
Delta Dell YW880 PowerEdge 2950 2970 Fan Assembly YW880 DC471
Dell PowerEdge 2950 Server Heatsink 0GF449 Xeon CPU Heatsink
Dell PowerEdge 2950 Cooling Fan PR272 DC471 YW880
Dell Poweredge 2950 Quad Fan Assy in Bracket PR970
4x Dell PR272 YW880 PowerEdge 2950 Fan Assembly 60x60x38mm 12v 1.68A PFC0612DE
