thats not gonna work, the breakdown of tire size
215- width of the tire in MM
55- is 55% of 215 to make up the hight of the sidewall
and 17 is the rim size
the stock size for the svt is 215/45/17 so the 215/55 is 10% taller than the stock size, and it will be rubbin the fender all day until it finally goes pop