No strap on main awning. How do I know the length I need?

They acted like it was the way to lower the awning and they each took a side and they lowered it using the bars. I have never had an RV with an awning so I was just trying to take in all that they were showing me about the appliances and whatnot. It didn't occur to me that there should be a strap.

So the 93" one will be long enough or even need to be trimmed a bit? I just didn't know if there were longer ones than that. I found one on Amazon for $10 with great reviews.