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The key to this question is that it was industry wide change. I like the wiper answer, because this is a good indicator for a late 60's change.
The answer is curved side glass. I can only come up with 3 reasons for this industry wide change.
1) Safety things like padded dashes started happening so maybe curved glass is stronger?
2) Strictly a styling change
3) Roofs could be smaller so less materials and thus less costs.
Okay, Becky I'll pass to you for the next question.
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