there are 2 idlers on milners one is for left hand drive trucks the other is for right hand drive trucks, the play will be in the ball joints that are on the relay arm, its a common problem and they dont last very long at all i had an uprated one made from makeit fit and also had the steering idler uprated at the same time, the play in the wheels could be the bearing need nipping up a bit again an easy enough job to do yourself.