finished.
https://photos.app.goo.gl/cdMJTB4iuaEQ1tfM7
https://photos.app.goo.gl/yH3jsfkWnVW3YSaX7
look ok tbh, they'll do instead of spending £150 on them (cost about £20 all in)
in retrospect i think i should have maybe gone with less metal between the holes (not sure of terminology of that)
ended up painting it black since it looked a bit weird being aluminium coloured when the car is dark gray and nothing really alu coloured anywhere on the car.