Assembling the VisionFive2 Metal Case

I bought a Metal Case for the VisionFive2. I couldn’t understand the assembly of the metal case, because I couldn’t find any documentation, I only saw a picture.

6 thermal pads came out of the box. Where should I stick them? I stuck them like in the picture.

In addition, 2 metal ring came out of the box. I have no idea how to use it. There is only one metal ring on the back of the fan. (indicated by the orange line).

I’d be very grateful if you could help me.

Board link:

How to Install Image

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Two metal rings came out of the box.