i bought them from troopster and had problems too. I broke one side trying to put it on. all you have to do is stay calm while doing it. You dont just push it all down at once. You slowly push little by little giving it a little more muscle. Eventually it just snaps in. Try to stick your head underneath to make sure its aligned and then just slowly push it down. You really dont have to push it hard it all it should just snap into place. I learnt that the hard way.