Yep, it looks like those clips are what I need!

Since I don't climb and this helmet is going to be used exclusively for SAR operations, purchasing another helmet is not really an option. I got this helmet for 5 $ and it seems as I could get those clips for another 5-6 $. Much cheaper than the Petzl climbing helmet.

I don't know if this goes against a forum rule, but since i'm in Canada, websites have a tendency to exagerate terribly when it comes to shipping rates... Maybe someone could put his hands on these clips, mail them to me and I would be more than happy to repay using Paypal? Just wondering.

Thanks guys for your replies, I appreciate them.