[Paul Huryk]

Honestly, to make wide front fenders like you mentioned would be easy - assuming you could stomach the bill for dies to make them out of steel; probably the reason for fiberglass.

Rear is a different animal as you would have to either put flares over the existing bodywork, or cut up the car and put new ones out of steel. Fiberglass is easy, but with the different materials and expansion rates, you wil get cracks if you bond them in. You could do a Japanese widebody with flares that bolt or rivet - but those look terrible for the most part.

I wouldn't even think about them for less than a 2 inch widebody, which then you could add another 50mm of tire, which could be a 315 up front and a 335 out back with the right wheels.