Cargo Net
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Since we have a little daughter and often carry a stroller in the back, I decided to add a cargo net to prevent things from coming over the rear of the back seat. So I ordered a net.
I placed the net over the rear head rests, ...
... wrapped the Velcros loosely over the roll bar, placed the long straps on the upper left and right over the bar and connected them at the center (interior light) on the roll bar.
The little metal hooks go under the lip of the body on the left and right. I had to push the carpet down a bit to get them in.
The Velcros and the long straps are tightened.

Here a pic of the net in place with the stroller in the back.