It's true that you can find non-standard fan sizes in mfg. catalogs, but actually finding one for sale somewhere is next to impossible....... that includes 92x20.
The only fans commonly available even close to that size..... Yate Loons 120x20, and a Scythe 100x12. Jabtech has the Yates and the Scythe fan is only available (for now) in a HSF combo called Schriken (sp.?).
This HSF from Directron comes with a 92x15 fan, but there is little info about the thing.....
Here's the 100x12 from Scythe,, available in two speeds. I have two of the faster versions.....work ok, but require over 6V to start/run. Fairly quite under about 10V.