I see no reply to your question. I have been looking at this part of the bumper as part of my prep to add a nudge bar. The part is actually removable by taking out the clips along the back towards the underside engine cover. The front presses on with clips. The unfortunate thing is it looks like this part is not painted but is, in fact, a coloured moulded plastic part (probably a black base) complete with the colour embedded in a gloss plastic overcoat (the silver colour). The workshop manual lists the colour simply as "Material Colour" which points to it not being painted. The finish is gloss plastic so I suspect it is fully moulded plastic.
The best you can do is find a close colour in a spray pack as I doubt there is a colour available.