Installing mud flaps on 2024 F150 XLT?

[Hot wheels]

I did not receive the j item with the parts. Is this a shim of some sort ? Also the support brackets on both sides have a slight amount of play. Any ideas ? Thanks​

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[oncechance]

You will need a spacer between the aluminum and steel, which is the plastic shim you are missing. Steel and aluminum do not mate well. Not sure about the play you mention.