This is a topical question for me. The Abarth wheels were matt black on my Sei when I got it and intended to respray them this colour after I refurb them. What's making me rethink this colour is that I noticed the grey primer I'm using on other bits of the car looks really good against the yellow, so I am now thinking that this might also be a good choice. If you, or someone you know, is decent with Photoshop, they might be able to mock up a photo of your car with different colours to at least give some idea.