306-2600 - 40mm x 40mm x 6mm fan, 5V operation, 2.6 l/s flow.
306-2612 - 40mm x 40mm x 6mm fan, 5V operation, 2.07 l/s flow, low noise.
306-2624 - 40mm x 40mm x 6mm fan, 5V operation, 1.66 l/s flow, super low noise.
In the current farnell catalogue, these are all £8.61 ea. The first one is what I use for the graphics board upgrade, tapped into the 5V supply on the upgrade board. Note that these fans have absolutely
NO reverse polarity protection. Connect them backwards and you're out one fan. Dammit.
The fan can be held in very easily with the same plastic rivets that were used on the power devices on the Mk1 player. These are in packs of 100, farnell number 722-4321, £2.91 per pack.
pca