Sorry, but I need to come back to this.
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Something irritated me and now I found what. When I look at the shackles I see two different types. Both can be used in the way you use it regarding the rope (just looking at the rope) However, people looking at this should be aware, that the red shackle is a chain shackle which should only used in a straight pull. That is not the case here if you take the car mountpoint into the setup. The silver anchor shackle can be used to pull at an angle or with two ropes attached to it, so that is fine.
If I look at the way the shackles are used at the car, I see a missuse. The shackle should have nearly no space to move with its pin to the one or the other end of the shackle eyes. In other words, the metall eyes where the shackles are mounted to are to thin and the shackle will be in a position like you see it at the red shackle. That is not ok.
To have your setup right, you should use two anchor shackles mounted with their body to the mounting eyes of the car and mount the relative breadth ropes at the pins. When you pull the anchor shackles will be pulled at an angle (also changing the WLL loosing less than 30% at a maximum here), but that is ok for them.
I would not use chain shackles as you not gain a straight pull here end to end.
This setup in the picture therefore just needs to use anchor shackles turned by 180 degrees.
AWo
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. The recovery points on the Grenadier allow for a different set up with the shackle body against the recovery point to allow articulation and the pin of the shackle with the bridle strap in. Just a picture I grabbed of the internet and I really should have looked at the shackles. We’ll spotted 
