Nope you can't buy one, but you can make one. It's a 20mm thick Yate Loon (from Jabtech)......with the flange cut off using a bench grinder. You could also use a Dremel, but the grinder is fairly easy.
There are many reasons why you might need a thin fan.....mostly clearance related. If you want to mount this in the orientation that uses the now cut-off flange, you can make four stand-off posts out of rubber hose. Attach the setup using zip-ties. This would give you a de-coupled thin 17x120. Not bad.
17mmx120mm Yate Loon
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