questions about super beetle

[GL-Aussielooker]

I've sold my type 3 squareback and I'm looking at getting one to do a German Looker.

My question is about the windshield. I've seen some supers where the windshield is flat and some that are curved. Some even look more curved than others. Or are all curved windshields the same and it just looks more curved.

What year would be the best one to get to have the most curve in the windshield?

any information is greatly apperciated.

Thanks