Vinyl top center deck - does it matter?

I've got a '69 Barracuda notchback that originally had a white vinyl top. There are tiny bits and pieces of it (like a post-it note's worth total) but other than that I have no idea what the original center deck is. Does it actually matter in terms of fitting a new top , i.e. is there such a thing as a 34" center deck car vs a 43" center deck car, or did it just depend on what vinyl they had on hand?