I have what I believed to be a stock maxi airbox, but it does not fit. The protruding round part that usually fits into the hole in the maxi frame is about 1/4" to far back to get the air box to fit right. Are there different versions of these things? Never ran into this problem before. I just got the ped, a maxi n, and it did come with a bing clone carb. The carb is not the issues as the filter box from my other maxi fits fine and the questionable airbox does not fit either bike. Anyone know what is going on?