38" or 43" seam for vinyl top

I contacted Dante's because they are a legendary dealer, inquiring, on which top to choose and here is his response. I thought you had to measure your roof?

You would need to measure your original top.
If you don't have your original top then there is no way of knowing what your car had originally but the 38" is the most common size we sell.

The roof has nothing to do with the seam distance of the top. The top is exactly the same for all Darts, only the distance between the seams varied depending on production and supplier. Most original cars that we have seen had 38" seams.

So should I just go ahead with the 38"?

1970 Dart Swinger 2dr originally equipped with a full vinyl top.