Blazer top ?
 

PLease correct me if I'm wrong

73-74 two piece tops and then in 75 it was one molded piece is this correct!

and if so which one is better it seems to me a one piece would be prone to crack since its ridged and has no way to flex?

Re: Blazer top ?
 

I've heard of single and double wall tops on the first gen's but nothing about 1 piece or 2 piece version on 73-75's. I worked under the impression that 73-75 tops were the same.

Where's the seam? front to back? just what are you saying is different?