Lance,
You will find several methods to secure your rear hatch. Some are inovative in that they are setup so you can't forget to actually "latch the hatch" so to speak, to prevent opening at speed.
I didn't like the setup you show, even though it is close to if not exactly as the originals. It however requires cables, pull handles and mounting pieces to the rear hatch that require some hard to align setups. I went with the Aerocatch system. It can be viewed here.
Bonnet Pin - Bonnet Latch - Hood Latches - AeroCatch
This system can be setup rather easily, but requires some body cutting to place. It is a very good system in that you would be hard pressed to miss the yp position on the locking clip. Even if you did close the locking clip and didn't lock it, it would still hold the clip closed.
It comes in either locking or non locking. I chose the locking to keep the curious from trying to sneak a peak, as happened to one forum member.
You can also set it up as a side catch system as well which could replace the side latches if you so chose.
Bill