Ok, Whilst not being to my personal choice I found this quick & easy grill star change to black on E Bay, as the adhesive is as used on other products this should work, with of the course the bonus of easy change back when you sell the car
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Mercedes Gloss Black Front Grille Star Badge Cover A C GLA CLA ML CLS E Class | eBay
FITS: A-CLASS w176, C-CLASS W205, B-CLASS W246,GLA X156, GLK, CLA C117, ML, E CLASS W212, CLS C218 and most latest star as pictured. Fits most of the new star with honeycomb back wont fit radar as they are flat.
www.ebay.co.uk