Are early and late model roofs interchangeable? Can you use a 1973 roof on a 1975 car, and have it fit correctly? Or is there any modification that is necessary?

Question1: Nope
Question 2: 73 and 75 should be the same

Thanks. Does anybody know where the break point for the roofs working on other years is? I am assuming that maybe 1973 changed?

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Thanks. That is very helpful.

It seems that the break is pre-73 vs. 73 and later. If anyone knows of any differences between '73/'74 vs. '75/'76, please let me know. I have a '75 chassis, and want to use the best roof I have for it (which I think is off of a '73). But, I want to make sure there aren't any differences.

No differences between 73 and 76

Perfect. Thanks.