[Vega_TB]

Yes, SS wheels should work for you without any modifications.
The standard tire size for SS wheels is P255/50/R20
But keep in mind that by switching to 20 wheel radius you will lose in comfort.

P.S What engine do you have?

 

[Vega_TB]

You may want to upgrade the front brakes to the ones from the V8. Larger rims put more stress on the braking system.
It's an easy swap and not expensive. I bought all the parts from Rockauto. I did to my '07 4.2 with 17 inch rims.

That's why I asked what engine this TВ has.