http://www.onlycubcadets.net/forum/n...noquote=1&p=20
Here is a frame comparison from our library. Starting with the 102 model, they had a taller tunnel. Except for the 71,72, and 73, they have the low tunnel with round fenders verses the squared off fenders of the other models.
I spent a lot of time looking on line at pictures and comparing them. It takes awhile to figure out the difference.
Randy