Narrowed fount beam to fit 18" wheels on 1500 beetle

[paulgrey]

Hello, I have just bought a set of 18" by 7.5" wheels that I am planing to put on my 1500 beetle, the wheels fit but I find that when I to=urn the steering to full lock I am getting contact between the strut tower (wich has been ground back) and the rim and also the lower suppension arm. I think the best way to overcome this is to norrow the front beem and put the wheels on spacers... however I have had a look and am wondering how much the beem can be narrowed by. Any advice would be welcomed, Buy the way it looks absolutley sick with the wheels on 18" Chrome DTM wheels.