fyi..theres a good chance your carbon ones may have been glued on depedingin where they came from. Some have a bolt thru the back some are bond to bumper.
@Saint27 , i tried to order from Renault earlier in the year and as @dablk says they are no longer available. I ended up getting some from Spray Shack. They are bolt on and they sprayed them for me with stiple type effect so they look like the genuine textured plastic ones.
As above they have been discounted and are no longer available from renault Uk or France but they had dropped the price down RRP of £39 for the pair just before they stopped them