Guy's you are not ordering parts for your Factory Mustang or whatever.

These cars are just like the originals, no two are exactly the same.

I put these same Spiral Sidpipes on my car after it was finished, another words replaced the existing stock sidepipes. Did they fit perfectly, no. So I did what any good car builder or fabricator would do and made the changes to make my pipes fit my car. That's what you do. That's what all of us car builders have done.

From your pictures it looks like an easy fix, I suggest you go that direction.