just bought some,fitted them yesterday
you can gently lever the old ones out and re use them though , i had 2 missing somehow when i put mine back together
they are quite expensive though so best to try and get yours out carefully
i have the part number if you need it
you might find some rust under there ,i did as one side was full of mud where it had been parked up for yrs against a row of hedges
before i put mine back on a i put some wax on the new paint and drilled 5 small holes along the bottom edge of the grey trims to try and keep it cleaner underneath