I have an 08 Impala and it has 16 inch rims stock on it which i in my research know 16s were the smallest for the model there were also 17s and 18s which what I want to do is upgrade to a set of simi stock looking 18s . Simi stock i mean they are supposed to be aftermarket but look the the double arm 5 star rims you already get in 18s but black with silver accents. My questions are 1 will these simply fit as it says when I looked at them and 2 is the any other mods like shocks I may have to do. The help the fit. All comments are appreciated on this i am at a loss on if I should do this as I plan.