All thank you very much for helping me out, i solved the problem by putting aluminium strips on the side pannel of 1cm so that the cooler can fit. it costed about 5 bucks and it works perfectly good. I used removable tape so that it will stay in place here is a picture:
http://gyazo.com/4387f4505f7210e45c40007fecc20bb6
just wanted to let you guys now how i did it so maybe someone else with my problem can do the same.