I have black roof rails and chrome side bars. Probably gonna change for black sidebars eventually as dented mine on a nice rock hidden in verge in Ilfracombe
My initial concern was black will show up chips, scratches easily but will look better with my black roof bars.
Rails are easy to fit once you work out left and right parts! If the same as mine they will have Left / Right on the bottom of the plastic inserts (but in Turkish!).