Home depot has the brackets too. What will matter is the spacing of those existing posts. If you are buying premade sections the spacing will probably be too big. If too small you can of course cut the section down. If its longer you can build the sections custom sized with 2x4s and pickets. You could also rent a core drill and add extra metal posts in between. Good luck!

Hell yeah Clutch rocks!!! Big news 1 and 2, with 2 being more of a rocking song for an entrance.

Also for OP, songs from the Pirates of the Caribbean sountrack.