The top of the side latches are different but I think the rest is basically the same. If you do get it make sure the caps for the latches are there. That is the major difference and the tops do not interchange with the later model.
I have an excuse for my ignorance.
I only had the hardtop on once in the 16 years I owned my '74, and only once also on my '86.
Since 1988 my garage ceilings have been permanently decorated with hanging hardtops.
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