Join Date: Oct 2016
Location: Hereford, England, UK
Hi Chris, congratulations on your purchase and welcome to the forum. As you are in the UK, I'd steer you towards Direct 4x4 for your after-market accessories at more sensible prices than OEM.
Have a look here: Running Boards for GLC 2016 onwards
Just once I want someone to call me "Sir" without adding "you're making a scene."