Farnell currently have suitable fans on offer at a pretty good price (about ?10)
I just bought 6 to use in my collection of 66xx system power supplies currently being slowly cleaned up and fixed.
Farnell part number 1545836
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Michael Kellett,
MK Electronics Ltd.,
Unit 4,
Greenlaw,
Castle Douglas,
DG7 2LH,
01556 506999
07968 111148
www.mkesc.co.uk