The manufacturer of the original OEM fan in my Airport Extreme is SUNON. It can be found on eBay. MG60121V1-CO1U-S9A is the part number on the one I extracted from my Airport. SUNON MagLev, DV12V, 4.20W.
I found a fan on eBay that was shipped from China. The OEM manufacturer of the original fan in my Airport Extreme is SUNON, the same brand I found on eBay.
When putting the cover back on after completing the fan replacement, be sure you put the side with the cutout on the same side of the Airport that has the LAN and power connectors. The black cover can only go back on in one correct position. Look at the inside bottom of the black cover and you’ll see one side is configured differently. Place that different side to align with the LAN and power holes of the Airport unit, then push it down gently into place.
When putting the metal plate back on, be sure all wiring does not get pinched. The wires sit in little cutouts so they don’t get pinched.
The large clip is lifted out of it’s holder by lifting the clip up toward the top of the device, like upward toward the sky. Don’t lift it from the very bottom because it’s in a little holding case. The small clips are different. They lift outward away from the circuit board. Just put a flat screwdriver blade behind the wire just above the clip and lift it off - not upward - but in the opposite direction of the circuit board.
The black cover is about 1/8 to 1/4 inch thick and is held in with pressure points. Might be good to use two spudgers or thin, flat screwdriver tips.
When removing the fan, begin by lifting the side with only one screw because the other side has the wiring tucked under a rubber piece that’s bendable. Push the rubber piece to the side to get the wire out from under it so you can completely remove the fan.