It's very difficult for me to understand what it is you're describing. If I have it correctly, you would cut the studs off and re-weld them in the place you want them? The welds would snap off same soon as you put stress on them which would be extremely dangerous. Don't do that. Also, tire sizes are very critical for spacing and need to be calculated both for diameter, width and wheel offset. Unless you plan on modifying the bodywork around the arch and relocate the radiator, it would be much more work than what you're describing. My 185/55/14's are the absolute largest that fit my setup. Even then, the driver's side rear lower corner needs to be ground down a bit to enable the wheel to hit the left turn lock. The body of the Europa is definitely not perfectly symmetrical.