AN9 vs. AN10

[Trummel <trummel@caa.army.mil>]

Hi guys,

Can anyone explain to me, in a short sound bite that even I
can understand, what's the diff between an AN9 and an AN10?

I'm making a chart/table on Sprite production, and I don't
have a lot of books that address this.  It seems like they
are both square-bodied convertibles with 1275 cc engines --
so why did they change the series number from 9 to 10?

TIA.  Befuddled in Bethesda.  Reid