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These are the armour plates for the cargo bed.
The larger one is for the floor, while the other two are for the top of the wheel arches.
I designed these two longer than needed to allow you to cut them to fit the exact size in your model.
Keep in mind that you have to add a plate on the vertical side of each of the wheel arches (not shown in the renders); since they are flat without any shaping, you can easily make them with plasticard 0,75mm thick.