What's the difference between a 1928 and 1930 Ford Model A?

What's the difference between a 1928 and 1930 Ford Model A?

Find a Model A club to get the best answers.
The 28 and 29 models were all the same.
The 30 and 31 models had a different frame at least.
The radiator shell changed after 29. The headlights and the cowl line also changed.
Take some time to study the information at this link:
http://www.macsautoparts.com/store/model-a-specs/