It looks like the seat may not be installed, not sure. Could be in one of the 2 cardboard boxes. Which may mean that they are able to strap over top of the bike without the seat ?????
Notice also that the side painted panels that say F6B are not on and able to be scratched on this pic.
Make sure you get the slack completely out of the extensions and that they're flat. I had mine come loose my last trip, got a little scuffing on my mirror from the trailer wall...could've been a lot worse.
And you can find the extensions at most Harley Dealerships...for some reason they sell a lot of them...