Alloy Wheels Rub ?

Tried to put a set of alloys on my Kangoo and the back left wheel rubs against the inside of the car ( not the arch ) been told that the " swinging left arm " of the axle is knackered and I would be better replacing the whole axle with one out the scrappy , could it be that I should be putting comercial wheels on my Kangoo instead of trying make it look a bit better with 14in clio alloys , can anyone advise what I should do and what exact tyre/ wheel size should I use on my Renalut Helios 1.4 Kangoo 2001 . thanks in advance to all any who reply .