Attaching a ute canopy

Hi guys,

I just bought a second hand canopy for my dual cab rodeo and I was wondering how to remove the bars at the back of the cab window so I can install the canopy... has anyone done this before? Do I just use an angle grinder and cut them off or can they be removed from underneath?

If it wasn't the weekend i'd just call the appropriate local business but I am hanging out to get it on!

Thanks :)

Jess