How far apart are the mounting holes on a 92mm case fan?

I have a case that is advertized to accept an 80mm or a 120mm fan on the
rear exhaust vent. I accidentally ordered a 92mm fan instead. I didn't
notice until it was too late (it laready shipped). Am I going to need an
adapter? If so, - Well, I see all sorts of 92 to 80mm adapters out there.
I can't seem to find a 92mm to 120mm adapter any where. Is there such a
thing?