what do u mean 4 rear wheel or 4 front wheels
rocafella do u have bonneville rims?? i know bio had that style on his old gp but his were 20's or 19's
fronts are 255 45 18s rears are 225 50 18s....i would get 4 fronts
i had 19" mille miglia EV-S. not the same style, they have a flatter section on the spoke and they are a little wider too.
you probably wont run 255 wide tires on the back without rubbing. get the front wheels and switch the tires for 245s and youre golden.