I can refurb a set for you.I also think i have a spare M3 set sitting on the shelf,so we could do an exchange when its donne.

Usually i dont take pictures of work we do ,but here we did M3 caliper rebuild on Mad Mikes touring.We got the calipers sand blasted,then powder coated,and then assembled with all the new parts.
https://scontent-lhr3-1.xx.fbcdn.net...45751286_o.jpg
https://scontent-lhr3-1.xx.fbcdn.net...61995041_o.jpg
https://scontent-lhr3-1.xx.fbcdn.net...73940647_o.jpg
https://scontent-lhr3-1.xx.fbcdn.net...39125564_o.jpg