There is apparently a plastic fan mount "thing" that you connect the fan to, and then slide that into the slots on the funnel. If your case is missing it, give the guys at Fong-Kai USA
a shout, they should be able to fix things for you. They're a generally helpful bunch.
But in reality...you probably don't need or want it. With a 120 in the back there is all kinds of air flowing in the bezel. I'd add the 92 only if you needed to spot-cool your HDD's. (ie, if their temps were over 50° or so)
Oh, and WELCOME TO SPCR!!!!