The swingarm was powder coated ? How did they do the riveted plate ? If I remember correctly, it’s a fibrous or plastic composition.
I had mine coated, drill out the rivets, the plates are metallic with a rubber pad under them, so they powder coat also, I think the hole diam. of the rivets allowed me to tap them to 4mm or so I can’t remember exactly, then reinstall rubber pads and plates with stainless button heads.