159 Sportswagon factory roof rail removal to repaint

[Alpini]

Hi guys,
Would love to remove the factory fitted roof rails on my 159 JTDM sportswagon to give the end caps a respray as the original paint obviously was not designed for our harsh sun conditions.
I've been able to remove the center support plastic no worries it is just the 2 x larger end caps I require some advice on removing as I'm worried I'll snap a clip without knowing what cover to remove.
Thanks in advance
Adrian