In the Corvair Basics book they list that in 1961 there was a model 500, model 700, and a Monza. Is the Monza and a model 900 one and the same? There is one on E-Bay that is described as a Monza, but has an emblem on the Glove box that calls it a 900. Just what is a model 900? Thanks. Cecil Mills Cocoa, Fl.