How to remove metal bracket which holds side skirts on

[.k.]

wow confusing title but i'm trying to remove this:

http://i73.photobucket.com/albums/i226/ortivt6/DSC00197.jpg

I tried heatgun - it will work but as i'm trying to peel the metal away it changes shape/warp so i stopped and now need some help :wave:

[.k.]

all good plz delete